Transition metal carbide-based photocatalysts for artificial photosynthesis

Abstract

Transition metal carbides, including both MXene and non-MXene metal carbides, have enjoyed a soaring reputation in recent years. Benefitting from their intriguing physical and chemical characteristics, they shine in multifarious research fields and currently, they have emerged as promising nanomaterials for photocatalysis in energy and environmental science. Herein, based on the recent theoretical research and experimental studies, a systematic and comprehensive review of the expeditious advances of metal carbides and their nano-architectures in the flourishing arena of photocatalysis is presented. The fundamental mechanism involved in photocatalysis with metal carbides serving as semiconductors or cocatalysts is thoroughly discussed. Besides, we highlight the main synthetic strategies of MXene and non-MXene metal carbides and unravel the structural properties of the as-obtained metal carbides via different fabrication routes to establish and elucidate their intriguing role in ameliorating photocatalytic activity. Moreover, the state-of-the-art advancements of metal carbides in diverse photocatalytic applications, including hydrogen evolution reaction, oxygen evolution reaction, overall water splitting, and carbon dioxide reduction reaction, are summarized. In particular, insights into the structure–activity relationship of metal carbide in photocatalysis are elucidated. Finally, this review concludes with the ongoing challenges and perspectives on the future directions of metal carbides in the realm of photocatalysis.

Keywords

cocatalysts / metal carbides / MXene / non-MXene / photocatalysis / photocatalysts

References

[1] Zuo G, Wang Y, Teo WL, et al. Enhanced photocatalytic water oxidation by hierarchical 2D-Bi₂MoO₆@2D-MXene Schottky junction nanohybrid. Chem Eng J. 2021;403:126328.

[2] Ma B, Zhang S, Wang W, et al. A novel earth-abundant W-WC heterojunction as efficient co-catalyst for enhanced photocatalytic H₂ evolution. ChemCatChem. 2020;12(4):1148-1155.

[3] Looney B. BP Statistical Review of World Energy 2021: a Dramatic Impact on Energy Markets. Accessed April 4, 2022. https://www.bp.com/en/global/corporate/news-and-insights/press-releases/bp-statistical-review-of-world-energy-2021-a-dramatic-impact-on-energy-markets.html

[4] Centi G. Smart catalytic materials for energy transition. SmartMat. 2020;1(1):e1005.

[5] Kang S, Sun T, Ma Y, et al. Artificial photosynthesis bringing new vigor into plastic wastes. SmartMat. 2023;4:e1202.

[6] Abe JO, Popoola API, Ajenifuja E, Popoola OM. Hydrogen energy, economy and storage: review and recommendation. Int J Hydrogen Energy. 2019;44(29):15072-15086.

[7] Perera F. Pollution from fossil-fuel combustion is the leading environmental threat to global pediatric health and equity: solutions exist. Int J Environ Res Public Health. 2018;15(1):16.

[8] Anderson TR, Hawkins E, Jones PD. CO₂, the greenhouse effect and global warming: from the pioneering work of Arrhenius and Callendar to today's Earth System Models. Endeavour. 2016;40(3):178-187.

[9] Leiu YX, Ling GZS, Mohamed AR, Wang S, Ong W-J. Atomic-level tailoring Zn_xCd_1-xS photocatalysts: a paradigm for bridging structure-performance relationship toward solar chemical production. Mater Today Energy. 2023;34:101281.

[10] Ren Y, Foo JJ, Zeng D, Ong W-J. ZnIn₂S₄-based nanostructures in artificial photosynthesis: insights into photocatalytic reduction toward sustainable energy production. Small Struct. 2022;3(11):2200017.

[11] Oh VB-Y, Ng S-F, Ong W-J. Shining light on ZnIn₂S₄ photocatalysts: promotional effects of surface and heterostructure engineering toward artificial photosynthesis. EcoMat. 2022;4(5):e12204.

[12] Lin X, Ng S-F, Ong W-J. Coordinating single-atom catalysts on two-dimensional nanomaterials: a paradigm towards bolstered photocatalytic energy conversion. Coord Chem Rev. 2022;471:214743.

[13] Zeng J, Li Z, Jiang H, Wang X. Progress on photocatalytic semiconductor hybrids for bacterial inactivation. Mater Horizons. 2021;8(11):2964-3008.

[14] Yang X, Ye Y, Sun J, Li Z, Ping J, Sun X. Recent advances in g-C₃N₄-based photocatalysts for pollutant degradation and bacterial disinfection: design strategies, mechanisms, and applications. Small. 2022;18(9):2105089.

[15] Chen T, Liu L, Hu C, Huang H. Recent advances on Bi₂WO₆-based photocatalysts for environmental and energy applications. Chin J Catal. 2021;42(9):1413-1438.

[16] Kumar R, Raizada P, Verma N, et al. Recent advances on water disinfection using bismuth-based modified photocatalysts: strategies and challenges. J Clean Prod. 2021;297:126617.

[17] Naguib M, Kurtoglu M, Presser V, et al. Two-dimensional nanocrystals produced by exfoliation of Ti₃AlC₂. Adv Mater. 2011;23(37):4248-4253.

[18] Ouyang Z, Yang Y, Zhang C, et al. Recent advances in photocatalytic degradation of plastics and plastic-derived chemicals. J Mater Chem A. 2021;9(23):13402-13441.

[19] Nabi I, Bacha A-U-R, Ahmad F, Zhang L. Application of titanium dioxide for the photocatalytic degradation of macro- and micro-plastics: a review. J Environ Chem Eng. 2021;9(5):105964.

[20] Low J, Zhang L, Tong T, Shen B, Yu J. TiO₂/MXene Ti₃C₂ composite with excellent photocatalytic CO₂ reduction activity. J Catalysis. 2018;361:255-266.

[21] Zhang D, Li Y, Li Y, Zhan S. Towards single-atom photocatalysts for future carbon-neutral application. SmartMat. 2022;3(3):417-446.

[22] Zhang W, He H, Li H, et al. Visible-light responsive TiO₂-based materials for efficient solar energy utilization. Adv Energy Mater. 2021;11(15):2003303.

[23] Rawool SA, Yadav KK, Polshettiwar V. Defective TiO₂ for photocatalytic CO₂ conversion to fuels and chemicals. Chem Sci. 2021;12(12):4267-4299.

[24] Jiang L, Zhou S, Yang J, et al. Near-infrared light-responsive TiO₂ for efficient solar energy utilization. Adv Funct Mater. 2022;32(12):2108977.

[25] Ng S-F, Foo JJ, Ong W-J. Solar-powered chemistry: engineering low-dimensional carbon nitride-based nanostructures for selective CO₂ conversion to C₁-C₂ products. InfoMat. 2022;4(1):e12279.

[26] Yu X, Ng S-F, Putri LK, Tan L-L, Mohamed AR, Ong W-J. Point-defect engineering: leveraging imperfections in graphitic carbon nitride (g-C₃N₄) photocatalysts toward artificial photosynthesis. Small. 2021;17(48):2006851.

[27] Ong W-J. 2D/2D graphitic carbon nitride (g-C₃N₄) heterojunction nanocomposites for photocatalysis: why does face-to-face interface matter? Front Mater. 2017;4:11.

[28] Nasir JA, Rehman Z, Shah SNA, Khan A, Butler IS, Catlow CRA. Recent developments and perspectives in CdS-based photocatalysts for water splitting. J Mater Chem A. 2020;8(40):20752-20780.

[29] Yang K, Yang Z, Zhang C, et al. Recent advances in CdS-based photocatalysts for CO₂ photocatalytic conversion. Chem Eng J. 2021;418:129344.

[30] Foo JJ, Ng S-F, Ong W-J. Dimensional heterojunction design: the rising star of 2D bismuth-based nanostructured photocatalysts for solar-to-chemical conversion. Nano Res. 2022;16:4310-4364.

[31] Wang S, Wang L, Huang W. Bismuth-based photocatalysts for solar energy conversion. J Mater Chem A. 2020;8(46):24307-24352.

[32] Fujishima A, Zhang X, Tryk D. TiO₂ photocatalysis and related surface phenomena. Surf Sci Rep. 2008;63(12):515-582.

[33] Fu J, Yu J, Jiang C, Cheng B. g-C₃N₄-based heterostructured photocatalysts. Adv Energy Mater. 2018;8(3):1701503.

[34] Cheng L, Xiang Q, Liao Y, Zhang H. CdS-based photocatalysts. Energy Environ Sci. 2018;11(6):1362-1391.

[35] Wu N. Plasmonic metal–semiconductor photocatalysts and photoelectrochemical cells: a review. Nanoscale. 2018;10(6):2679-2696.

[36] Ulmer U, Dingle T, Duchesne PN, et al. Fundamentals and applications of photocatalytic CO₂ methanation. Nat Commun. 2019;10(1):3169.

[37] Cai J, Wu X, Li S, Zheng F. Controllable location of Au nanoparticles as cocatalyst onto TiO₂@CeO₂ nanocomposite hollow spheres for enhancing photocatalytic activity. Appl Catal B. 2017;201:12-21.

[38] Yu J, Wang K, Xiao W, Cheng B. Photocatalytic reduction of CO₂ into hydrocarbon solar fuels over g-C₃N₄-Pt nanocomposite photocatalysts. Phys Chem Chem Phys. 2014;16(23):11492-11501.

[39] Ran J, Gao G, Li F-T, Ma T-Y, Du A, Qiao S-Z. Ti₃C₂ MXene co-catalyst on metal sulfide photo-absorbers for enhanced visible-light photocatalytic hydrogen production. Nat Commun. 2017;8(1):13907.

[40] Pan Y-X, Peng J-B, Xin S, et al. Enhanced visible-light-driven photocatalytic H₂ evolution from water on noble-metal-free CdS-nanoparticle-dispersed Mo₂C@C nanospheres. ACS Sustain Chem Eng. 2017;5(6):5449-5456.

[41] Zhao Z, Wu J, Zheng Y-Z, Li N, Li X, Tao X. Ni₃C-decorated MAPbI₃ as visible-light photocatalyst for H₂ evolution from HI splitting. ACS Catal. 2019;9(9):8144-8152.

[42] Naguib M, Mochalin VN, Barsoum MW, Gogotsi Y. 25th anniversary article: MXenes: a new family of two-dimensional materials. Adv Mater. 2014;26(7):992-1005.

[43] Zhuang Y, Liu Y, Meng X. Fabrication of TiO₂ nanofibers/MXene Ti₃C₂ nanocomposites for photocatalytic H₂ evolution by electrostatic self-assembly. Appl Surf Sci. 2019;496:143647.

[44] Naguib M, Barsoum MW, Gogotsi Y. Ten years of progress in the synthesis and development of MXenes. Adv Mater. 2021;33(39):2103393.

[45] Feng A, Yu Y, Wang Y, et al. Two-dimensional MXene Ti₃C₂ produced by exfoliation of Ti₃AlC₂. Mater Des. 2017;114:161-166.

[46] Liu F, Zhou A, Chen J, et al. Preparation of Ti₃C₂ and Ti₂C MXenes by fluoride salts etching and methane adsorptive properties. Appl Surf Sci. 2017;416:781-789.

[47] Liu F, Zhou J, Wang S, et al. Preparation of high-purity V₂C MXene and electrochemical properties as Li-ion batteries. J Electrochem Soc. 2017;164(4):A709-A713.

[48] Meyer S, Nikiforov AV, Petrushina IM, et al. Transition metal carbides (WC, Mo₂C, TaC, NbC) as potential electrocatalysts for the hydrogen evolution reaction (HER) at medium temperatures. Int J Hydrogen Energy. 2015;40(7):2905-2911.

[49] Zhou X, Luo J, Jin B, et al. Sustainable synthesis of low-cost nitrogen-doped-carbon coated Co₃W₃C@g-C₃N₄ composite photocatalyst for efficient hydrogen evolution. Chem Eng J. 2021;426:131208.

[50] Deysher G, Shuck CE, Hantanasirisakul K, et al. Synthesis of Mo₄VAlC₄ MAX phase and two-dimensional Mo₄VC₄ MXene with five atomic layers of transition metals. ACS Nano. 2019;14(1):204-217.

[51] Mühlbauer G, Kremser G, Bock A, Weidow J, Schubert W-D. Transition of W₂C to WC during carburization of tungsten metal powder. Int J Refract Met Hard Mater. 2018;72:141-148.

[52] Wu HB, Xia BY, Yu L, Yu X-Y, Lou XW. Porous molybdenum carbide nano-octahedrons synthesized via confined carburization in metal-organic frameworks for efficient hydrogen production. Nat Commun. 2015;6(1):6512.

[53] Zhang C, Wang Z, Tu R, et al. Growth of self-aligned single-crystal vanadium carbide nanosheets with a controllable thickness on a unique staked metal substrate. Appl Surf Sci. 2020;499:143998.

[54] Xu C, Wang L, Liu Z, et al. Large-area high-quality 2D ultrathin Mo₂C superconducting crystals. Nat Mater. 2015;14(11):1135-1141.

[55] Wang Y, Guo T, Tian Z, Bibi K, Zhang Y-Z, Alshareef HN. MXenes for energy harvesting. Adv Mater. 2022;34(21):2108560.

[56] Pan L, Mei H, Liu H, et al. High-efficiency carrier separation heterostructure improve the photocatalytic hydrogen production of sulfide. J Alloys Compd. 2020;817:153242.

[57] Zhang J, Wu M, He B, Wang R, Wang H, Gong Y. Facile synthesis of rod-like g-C₃N₄ by decorating Mo₂C co-catalyst for enhanced visible-light photocatalytic activity. Appl Surf Sci. 2019;470:565-572.

[58] He K, Xie J, Yang Z, et al. Earth-abundant WC nanoparticles as an active noble-metal-free co-catalyst for the highly boosted photocatalytic H₂ production over g-C₃N₄ nanosheets under visible light. Catal Sci Technol. 2017;7(5):1193-1202.

[59] Tian L, Min S, Wang F, Zhang Z. Enhanced photocatalytic hydrogen evolution on TiO₂ employing vanadium carbide as an efficient and stable cocatalyst. Int J Hydrogen Energy. 2020;45(3):1878-1889.

[60] Tian L, Min S, Lei Y, Chen S, Wang F. Vanadium carbide: an efficient, robust, and versatile cocatalyst for photocatalytic hydrogen evolution under visible light. Chem Commun. 2019;55(48):6870-6873.

[61] Guo Z, Zhou J, Zhu L, Sun Z. MXene: a promising photocatalyst for water splitting. J Mater Chem A. 2016;4(29):11446-11452.

[62] Xiong K, Wang P, Yang G, et al. Functional group effects on the photoelectronic properties of MXene (Sc₂CT₂, T = O, F, OH) and their possible photocatalytic activities. Sci Rep. 2017;7(1):15095.

[63] Irfan RM, Tahir MH, Iqbal S, et al. Co₃C as a promising cocatalyst for superior photocatalytic H₂ production based on swift electron transfer processes. J Mater Chem C. 2021;9(9):3145-3154.

[64] Zhang Y, Sa B, Zhou J, Sun Z. Two-dimensional (Zr_0.5Hf_0.5)₂CO₂: a promising visible light water-splitting photocatalyst with efficiently carrier separation. Comput Mater Sci. 2021;186:110013.

[65] Su T, Hood ZD, Naguib M, et al. 2D/2D heterojunction of Ti₃C₂/g-C₃N₄ nanosheets for enhanced photocatalytic hydrogen evolution. Nanoscale. 2019;11(17):8138-8149.

[66] Xiong Y, Chen Y, Yang N, Jin C, Sun Q. WC_1−x-coupled 3D porous defective g-C₃N₄ for efficient photocatalytic overall water splitting. Solar RRL. 2019;3(5):1800341.

[67] Gao F, Zhao Y, Zhang L, et al. Well-dispersed MoC quantum dots in ultrathin carbon films as efficient co-catalysts for photocatalytic H₂ evolution. J Mater Chem A. 2018;6(39):18979-18986.

[68] Zhang X, Zhang Z, Li J, Zhao X, Wu D, Zhou Z. Ti₂CO₂ MXene: a highly active and selective photocatalyst for CO₂ reduction. J Mater Chem A. 2017;5(25):12899-12903.

[69] Wang H, Tang Q, Wu Z. Construction of few-layer Ti₃C₂ MXene and boron-doped g-C₃N₄ for enhanced photocatalytic CO₂ reduction. ACS Sustain Chem Eng. 2021;9(25):8425-8434.

[70] Qin T, Wang Z, Wang Y, Besenbacher F, Otyepka M, Dong M. Recent progress in emerging two-dimensional transition metal carbides. Nano Micro Lett. 2021;13(1):183.

[71] Wei Y, Zhang P, Soomro RA, Zhu Q, Xu B. Advances in the synthesis of 2D MXenes. Adv Mater. 2021;33(39):2103148.

[72] Peng J, Chen X, Ong W-J, Zhao X, Li N. Surface and heterointerface engineering of 2D MXenes and their nanocomposites: insights into electro- and photocatalysis. Chem. 2019;5(1):18-50.

[73] Lei W, Zhou T, Pang X, Xue S, Xu Q. Low-dimensional MXenes as noble metal-free co-catalyst for solar-to-fuel production: progress and prospects. J Mater Sci Technol. 2022;114:143-164.

[74] Li K, Zhang S, Li Y, Fan J, Lv K. MXenes as noble-metal-alternative co-catalysts in photocatalysis. Chin J Catal. 2021;42(1):3-14.

[75] Zhang K, Li D, Cao H, et al. Insights into different dimensional MXenes for photocatalysis. Chem Eng J. 2021;424:130340.

[76] Hong L, Guo R, Yuan Y, et al. Recent progress of two-dimensional MXenes in photocatalytic applications: a review. Mater Today Energy. 2020;18:100521.

[77] Tang R, Xiong S, Gong D, et al. Ti₃C₂ 2D MXene: recent progress and perspectives in photocatalysis. ACS Appl Mater Interfaces. 2020;12(51):56663-56680.

[78] Schneider J, Matsuoka M, Takeuchi M, et al. Understanding TiO₂ photocatalysis: mechanisms and materials. Chem Rev. 2014;114(19):9919-9986.

[79] Habisreutinger SN, Schmidt-Mende L, Stolarczyk JK. Photocatalytic reduction of CO₂ on TiO₂ and other semiconductors. Angew Chem Int Ed. 2013;52(29):7372-7408.

[80] Lim XB, Ong W-J. A current overview of the oxidative desulfurization of fuels utilizing heat and solar light: from materials design to catalysis for clean energy. Nanoscale Horiz. 2021;6(8):588-633.

[81] Xu Q, Zhang L, Yu J, Wageh S, Al-Ghamdi AA, Jaroniec M. Direct Z-scheme photocatalysts: principles, synthesis, and applications. Mater Today. 2018;21(10):1042-1063.

[82] Maeda K, Wakayama H, Washio Y, et al. Visible-light-induced photocatalytic activity of stacked MXene sheets of Y₂CF₂. J Phys Chem C. 2020;124(27):14640-14645.

[83] Hantanasirisakul K, Gogotsi Y. Electronic and optical properties of 2D transition metal carbides and nitrides (MXenes). Adv Mater. 2018;30(52):1804779.

[84] Cui X-H, Li X-H, Jin X-J, Yan H-T, Zhang R-Z, Cui H-L. Biaxial strain tunable quantum capacitance and photocatalytic properties of Hf₂CO₂ monolayer. Appl Surf Sci. 2023;616:156579.

[85] Guo S, Lin H, Hu J, Su Z, Zhang Y. Computational study of novel semiconducting Sc₂CT₂ (T = F, Cl, Br) MXenes for visible-light photocatalytic water splitting. Materials. 2021;14(16):4739.

[86] Ibrahim IAM, Abdel-Azeim S, El-Nahas AM, et al. In silico band-gap engineering of Cr₂C MXenes as efficient photocatalysts for water-splitting reactions. J Phys Chem C. 2022;126(35):14886-14896.

[87] Khorasani Baghini Z, Mostafaei A, Abbasnejad M. Y₂CF₂ and Lu₂CF₂ MXenes under applied strain: electronic, optical, and photocatalytic properties. J Alloys Compd. 2022;922:166198.

[88] Sunita , Ghanekar U, Meena S. Heteroatom induced tailoring electronic and optical properties of V₃C₂ MXene through bandgap opening: a computational insight. Chem Phys Lett. 2022;799:139639.

[89] Omugbe E, Osafile OE, Nenuwe ON, Enaibe EA. Energy band gaps and novel thermoelectric properties of two-dimensional functionalized Yttrium carbides (MXenes). Phys B: Condens Matter. 2022;639:413922.

[90] Xue K, Yan L, Ge Y, et al. Two-dimensional tetragonal and hexagonal lattices of transition metal carbides MC (M = Ti, Zr, Hf): observation of two nodal loops and strong light-harvesting ability. Appl Phys Lett. 2022;120(24):243101.

[91] Wang Y, Tao Y, Zhang Q, et al. The structural, elastic, electronic, and optical properties of Janus Zr₂COT (T = S, Se, and Te) MXenes. Solid State Commun. 2022;354:114893.

[92] Wang Z, Lin Z, Shen S, Zhong W, Cao S. Advances in designing heterojunction photocatalytic materials. Chin J Catal. 2021;42(5):710-730.

[93] Liu X, Kang W, Qi L, et al. Two-dimensional g-C₃N₄/Ti₂CO₂ heterostructure as a direct Z-scheme photocatalyst for water splitting: a hybrid density functional theory investigation. Phys E. 2021;134:114872.

[94] He Y, Zhang M, Shi J, Cen Y, Wu M. Improvement of visible-light photocatalytic efficiency in a novel InSe/Zr₂CO₂ heterostructure for overall water splitting. J Phys Chem C. 2019;123(20):12781-12790.

[95] Zhu XT, Xu Y, Cao Y, et al. Investigation of the electronic structure of two-dimensional GaN/Zr₂CO₂ hetero-junction: type-II band alignment with tunable bandgap. Appl Surf Sci. 2021;542:148505.

[96] Zhu B, Zhang F, Qiu J, et al. A novel Hf₂CO₂/WS₂ van der Waals heterostructure as a potential candidate for overall water splitting photocatalyst. Mater Sci Semicond Process. 2021;133:105947.

[97] Zhang M, Si R, Wu X, et al. Two-dimensional Hf₂CO₂/GaN van der Waals heterostructure for overall water splitting: a density functional theory study. J Mater Sci: Mater Electron. 2021;32(14):19368-19379.

[98] Low J, Yu J, Jaroniec M, Wageh S, Al-Ghamdi AA. Heterojunction photocatalysts. Adv Mater. 2017;29(20):1601694.

[99] Vinoth S, Ong W-J, Pandikumar A. Sulfur-doped graphitic carbon nitride incorporated bismuth oxychloride/cobalt based type-II heterojunction as a highly stable material for photoelectrochemical water splitting. J Colloid Interface Sci. 2021;591:85-95.

[100] Xu X, Ge X, Liu X, et al. Two-dimensional M₂CO₂/MoS₂ (M = Ti, Zr and Hf) van der Waals heterostructures for overall water splitting: a density functional theory study. Ceram Int. 2020;46(9):13377-13384.

[101] Li X-H, Wang B-J, Wang G-D, Ke S-H. Blue phosphorene/Sc₂CX₂ (X = O, F) van der Waals heterostructures as suitable candidates for water-splitting photocatalysts and solar cells. Sustain Energy Fuels. 2020;4(10):5277-5283.

[102] Guo H, Zhu B, Zhang F, et al. Type-II AsP/Sc₂CO₂ van der Waals heterostructure: an excellent photocatalyst for overall water splitting. Int J Hydrogen Energy. 2021;46(65):32882-32892.

[103] Xu X, Wu X, Tian Z, Zhang M, Li L, Zhang J. Modulating the electronic structures and potential applications of Zr₂CO₂/MSe₂ (M = Mo, W) heterostructures by different stacking modes: a density functional theory calculation. Appl Surf Sci. 2022;599:154014.

[104] Hao J, Wu J, Wang C, Zhu F, Yan X, Gu Y. Mo₂CF₂/WS₂: two-dimensional van der waals heterostructure for overall water splitting photocatalyst from five-step screening. J Phys Chem Lett. 2023;14(6):1363-1370.

[105] Xu Q, Zhang L, Cheng B, Fan J, Yu J. S-scheme heterojunction photocatalyst. Chem. 2020;6(7):1543-1559.

[106] Fu C-F, Li X, Yang J. A rationally designed two-dimensional MoSe₂/Ti₂CO₂ heterojunction for photocatalytic overall water splitting: simultaneously suppressing electron–hole recombination and photocorrosion. Chem Sci. 2021;12(8):2863-2869.

[107] Li B, Wang W, Zhao J, et al. All-solid-state direct Z-scheme NiTiO₃/Cd_0.5Zn_0.5S heterostructures for photocatalytic hydrogen evolution with visible light. J Mater Chem A. 2021;9(16):10270-10276.

[108] Zhang W, Mohamed AR, Ong W-J. Z-Scheme photocatalytic systems for carbon dioxide reduction: where are we now? Angew Chem Int Ed. 2020;59(51):22894-22915.

[109] Low J, Yu J, Jiang C. Design and fabrication of direct Z-scheme photocatalysts. Interface Sci Technol. 2020;31:193-229.

[110] Kumar R, Singh AK. Chemical hardness-driven interpretable machine learning approach for rapid search of photocatalysts. npj Comput Mater. 2021;7(1):197.

[111] Shen R, Lu X, Zheng Q, et al. Tracking S-scheme charge transfer pathways in Mo₂C/CdS H₂-evolution photocatalysts. Solar RRL. 2021;5(7):2100177.

[112] Shen J, Shen J, Zhang W, et al. Built-in electric field induced CeO₂/Ti₃C₂-MXene Schottky-junction for coupled photocatalytic tetracycline degradation and CO₂ reduction. Ceram Int. 2019;45(18):24146-24153.

[113] Sun Y, Jin D, Sun Y, et al. g-C₃N₄/Ti₃C₂T_x (MXenes) composite with oxidized surface groups for efficient photocatalytic hydrogen evolution. J Mater Chem A. 2018;6(19):9124-9131.

[114] Zhang L, Zhang J, Yu H, Yu J. Emerging S-scheme photocatalyst. Adv Mater. 2022;34(11):2107668.

[115] He F, Zhu B, Cheng B, Yu J, Ho W, Macyk W. 2D/2D/0D TiO₂/C₃N₄/Ti₃C₂ MXene composite S-scheme photocatalyst with enhanced CO₂ reduction activity. Appl Catal B. 2020;272:119006.

[116] Huang K, Li C, Meng X. In-situ construction of ternary Ti₃C₂ MXene@TiO₂/ZnIn₂S₄ composites for highly efficient photocatalytic hydrogen evolution. J Colloid Interface Sci. 2020;580:669-680.

[117] Zhou J, Li L, Gao XJ, Wang H. Clusterphene: a new two-dimensional structure from cluster self-assembly. Nano Res. 2022;15(7):5790-5791.

[118] Sui X, Chen H, Wang H, et al. Unique Mo₂C–CdS–Co@C heterojunction integrated with redox cocatalysts and multiple active sites for efficient photocatalytic H₂ generation. Int J Hydrogen Energy. 2022;47(27):13386-13398.

[119] Ma S, Deng Y, Xie J, et al. Noble-metal-free Ni₃C cocatalysts decorated CdS nanosheets for high-efficiency visible-light-driven photocatalytic H₂ evolution. Appl Catal B. 2018;227:218-228.

[120] Ma X, Li W, Ren C, et al. A novel noble-metal-free binary and ternary In₂S₃ photocatalyst with WC and “W-Mo auxiliary pairs” for highly-efficient visible-light hydrogen evolution. J Alloys Compd. 2021;875:160058.

[121] Du X, Zhao T, Xiu Z, et al. BiVO₄@ZnIn₂S₄/Ti₃C₂ MXene quantum dots assembly all-solid-state direct Z-Scheme photocatalysts for efficient visible-light-driven overall water splitting. Appl Mater Today. 2020;20:100719.

[122] Zhang T, Yu J, Huang J, Lan S, Lou Y, Chen J. MoC/MAPbI₃ hybrid composites for efficient photocatalytic hydrogen evolution. Dalton Trans. 2021;50(31):10860-10866.

[123] Ma B, Wang X, Lin K, et al. A novel ultraefficient non-noble metal composite cocatalyst Mo₂N/Mo₂C/graphene for enhanced photocatalytic H₂ evolution. Int J Hydrogen Energy. 2017;42(30):18977-18984.

[124] He K, Xie J, Liu Z-Q, et al. Multi-functional Ni₃C cocatalyst/g-C₃N₄ nanoheterojunctions for robust photocatalytic H₂ evolution under visible light. J Mater Chem A. 2018;6(27):13110-13122.

[125] Peng C, Xu W, Wei P, et al. Manipulating photocatalytic pathway and activity of ternary Cu₂O/(001) TiO₂@Ti₃C₂T_x catalysts for H₂ evolution: effect of surface coverage. Int J Hydrogen Energy. 2019;44(57):29975-29985.

[126] Wang H, Sun Y, Wu Y, et al. Electrical promotion of spatially photoinduced charge separation via interfacial-built-in quasi-alloying effect in hierarchical Zn₂In₂S₅/Ti₃C₂(O, OH)_x hybrids toward efficient photocatalytic hydrogen evolution and environmental remediation. Appl Catal B. 2019;245:290-301.

[127] Zuo G, Wang Y, Teo WL, et al. Ultrathin ZnIn₂S₄ nanosheets anchored on Ti₃C₂T_x MXene for photocatalytic H₂ evolution. Angew Chem Int Ed. 2020;59(28):11287-11292.

[128] Shen H, Ouyang T, Guo J, Mu M, Yin X. A perspective LDHs/Ti₃C₂O₂ design by DFT calculation for photocatalytic reduction of CO₂ to C₂ organics. Appl Surf Sci. 2023;609:155445.

[129] Shen R, He K, Zhang A, et al. In-situ construction of metallic Ni₃C@Ni core–shell cocatalysts over g-C₃N₄ nanosheets for shell-thickness-dependent photocatalytic H₂ production. Appl Catal B. 2021;291:120104.

[130] Liu J, Hodes G, Yan J, Liu S. Metal-doped Mo₂C (metal = Fe, Co, Ni, Cu) as catalysts on TiO₂ for photocatalytic hydrogen evolution in neutral solution. Chin J Catal. 2021;42(1):205-216.

[131] Wang H, Peng R, Hood ZD, Naguib M, Adhikari SP, Wu Z. Titania composites with 2D transition metal carbides as photocatalysts for hydrogen production under visible-light irradiation. ChemSusChem. 2016;9(12):1490-1497.

[132] Tian L, Min S, Wang F. Integrating noble-metal-free metallic vanadium carbide cocatalyst with CdS for efficient visible-light-driven photocatalytic H₂ evolution. Appl Catal B. 2019;259:118029.

[133] Ren C, Li W, Gu S, et al. ZnSe nanoparticles with bulk WC as cocatalyst: a novel and noble-metal-free heterojunction photocatalyst for enhancing photocatalytic hydrogen evolution under visible light irradiation. Appl Mater Today. 2020;20:100731.

[134] Zheng Y, Wang E, Zhou J, Sun Z. A theoretical study of 0D Ti₂CO₂/2D g-C₃N₄ Schottky-junction for photocatalytic hydrogen evolution. Appl Surf Sci. 2023;616:156562.

[135] Makola LC, Moeno S, Ouma CNM, Sharma A, Vo D-VN, Dlamini LN. Facile fabrication of a metal-free 2D–2D Nb₂CT_x@g-C₃N₄ MXene-based Schottky-heterojunction with the potential application in photocatalytic processes. J Alloys Compd. 2022;916:165459.

[136] Ye M, Wang X, Liu E, Ye J, Wang D. Boosting the photocatalytic activity of P25 for carbon dioxide reduction by using a surface-alkalinized titanium carbide MXene as cocatalyst. ChemSusChem. 2018;11(10):1606-1611.

[137] Wang W, Hood ZD, Zhang X, et al. Construction of 2D BiVO₄−CdS−Ti₃C₂T_x heterostructures for enhanced photo-redox activities. ChemCatChem. 2020;12(13):3496-3503.

[138] Liu J, Wang P, Fan J, Yu H. Carbon-coated cubic-phase molybdenum carbide nanoparticle for enhanced photocatalytic H₂-evolution performance of TiO₂. J Energy Chem. 2020;51:253-261.

[139] Wang P, Pan J, Yu Q, et al. The enhanced photocatalytic hydrogen production of the non-noble metal co-catalyst Mo₂C/CdS hollow core-shell composite with CdMoO₄ transition layer. Appl Surf Sci. 2020;508:145203.

[140] Yue X, Yi S, Wang R, Zhang Z, Qiu S. A novel architecture of dandelion-like Mo₂C/TiO₂ heterojunction photocatalysts towards high-performance photocatalytic hydrogen production from water splitting. J Mater Chem A. 2017;5(21):10591-10598.

[141] Pan Y-X, Zhuang H-Q, Ma H, Cheng J, Song J. Tungsten carbide hollow spheres flexible for charge separation and transfer for enhanced visible-light-driven photocatalysis. Chem Eng Sci. 2019;194:71-77.

[142] Li J, Wang Z, Chen H, et al. A surface-alkalinized Ti₃C₂ MXene as an efficient cocatalyst for enhanced photocatalytic CO₂ reduction over ZnO. Catal Sci Technol. 2021;11(14):4953-4961.

[143] Bie C, Yu H, Cheng B, Ho W, Fan J, Yu J. Design, fabrication, and mechanism of nitrogen-doped graphene-based photocatalyst. Adv Mater. 2021;33(9):2003521.

[144] Bie C, Zhu B, Xu F, Zhang L, Yu J. In situ grown monolayer N-doped graphene on CdS hollow spheres with seamless contact for photocatalytic CO₂ reduction. Adv Mater. 2019;31(42):1902868.

[145] Shao M, Chen H, Hao S, et al. N-doped vanadium carbide combined with Pt as a multifunctional cocatalyst to boost photocatalytic hydrogen production. Appl Surf Sci. 2022;577:151857.

[146] Zheng Y, Dong J, Huang C, et al. Co-doped Mo-Mo₂C cocatalyst for enhanced g-C₃N₄ photocatalytic H₂ evolution. Appl Catal B. 2020;260:118220.

[147] Gong S, Niu Y, Teng X, et al. Visible light-driven, selective CO₂ reduction in water by In-doped Mo₂C based on defect engineering. Appl Catal B. 2022;310:121333.

[148] Zhou J, Wang F, Wang H, Hu S, Zhou W, Liu H. Ferrocene-induced switchable preparation of metal-nonmetal codoped tungsten nitride and carbide nanoarrays for electrocatalytic HER in alkaline and acid media. Nano Res. 2023;16(2):2085-2093.

[149] Tao Q, Dahlqvist M, Lu J, et al. Two-dimensional Mo_1.33C MXene with divacancy ordering prepared from parent 3D laminate with in-plane chemical ordering. Nat Commun. 2017;8(1):14949.

[150] Meshkian R, Dahlqvist M, Lu J, et al. W-based atomic laminates and their 2D derivative W_1.33C MXene with vacancy ordering. Adv Mater. 2018;30(21):1706409.

[151] Zhou B, Yin H, Dong C, et al. Biodegradable and excretable 2D W_1.33C i-MXene with vacancy ordering for theory-oriented cancer nanotheranostics in near-infrared biowindow. Adv Sci. 2021;8(24):2101043.

[152] Meshkian R, Lind H, Halim J, et al. Theoretical analysis, synthesis, and characterization of 2D W_1.33C (MXene) with ordered vacancies. ACS Appl Nano Mater. 2019;2(10):6209-6219.

[153] Halim J, Palisaitis J, Lu J, et al. Synthesis of two-dimensional Nb_1.33C (MXene) with randomly distributed vacancies by etching of the quaternary solid solution (Nb_2/3Sc_1/3)₂AlC MAX phase. ACS Appl Nano Mater. 2018;1(6):2455-2460.

[154] Tang Y, Yang C, Xu X, et al. MXene nanoarchitectonics: defect-engineered 2D MXenes towards enhanced electrochemical water splitting. Adv Energy Mater. 2022;12(12):2103867.

[155] Fang Y, Cao Y, Tan B, Chen Q. Oxygen and titanium vacancies in a BiOBr/MXene-Ti₃C₂ composite for boosting photocatalytic N₂ fixation. ACS Appl Mater Interfaces. 2021;13(36):42624-42634.

[156] Peng C, Xie X, Xu W, et al. Engineering highly active Ag/Nb₂O₅@Nb₂CT_x (MXene) photocatalysts via steering charge kinetics strategy. Chem Eng J. 2021;421:128766.

[157] Ma X, Ren C, Li H, et al. A novel noble-metal-free Mo₂C-In₂S₃ heterojunction photocatalyst with efficient charge separation for enhanced photocatalytic H₂ evolution under visible light. J Colloid Interface Sci. 2021;582(Pt B):488-495.

[158] Mansingh S, Kandi D, Das KK, Parida K. A mechanistic approach on oxygen vacancy-engineered CeO₂ nanosheets concocts over an oyster shell manifesting robust photocatalytic activity toward water oxidation. ACS Omega. 2020;5(17):9789-9805.

[159] Tan X-Q, Mo W, Lin X, Loh JY, Mohamed AR, Ong W-J. Retrospective insights into recent MXene-based catalysts for CO₂ electro/photoreduction: how far have we gone? Nanoscale. 2023;15(14):6536-6562.

[160] Li Y, Chen X, Sun Y, et al. Chlorosome-like molecular aggregation of chlorophyll derivative on Ti₃C₂T_x MXene nanosheets for efficient noble metal-free photocatalytic hydrogen evolution. Adv Mater Interfaces. 2020;7(8):1902080.

[161] Malaki M, Varma RS. Mechanotribological aspects of MXene-reinforced nanocomposites. Adv Mater. 2020;32(38):2003154.

[162] Zhang W, Peng J, Hua W, et al. Architecting amorphous vanadium oxide/MXene nanohybrid via tunable anodic oxidation for high-performance sodium-ion batteries. Adv Energy Mater. 2021;11(22):2100757.

[163] Anasori B, Lukatskaya MR, Gogotsi Y. 2D metal carbides and nitrides (MXenes) for energy storage. Nat Rev Mater. 2017;2(2):16098.

[164] Ghidiu M, Lukatskaya MR, Zhao M-Q, Gogotsi Y, Barsoum MW. Conductive two-dimensional titanium carbide ‘clay’ with high volumetric capacitance. Nature. 2014;516(7529):78-81.

[165] Li M, Lu J, Luo K, et al. Element replacement approach by reaction with Lewis acidic molten salts to synthesize nanolaminated MAX phases and MXenes. J Am Chem Soc. 2019;141(11):4730-4737.

[166] Li T, Yao L, Liu Q, et al. Fluorine-free synthesis of high-purity Ti₃C₂T_x (T = OH, O) via alkali treatment. Angew Chem Int Ed. 2018;57(21):6115-6119.

[167] Xuan J, Wang Z, Chen Y, et al. Organic-base-driven intercalation and delamination for the production of functionalized titanium carbide nanosheets with superior photothermal therapeutic performance. Angew Chem. 2016;128(47):14789-14794.

[168] Pang SY, Io WF, Wong LW, Zhao J, Hao J. Efficient energy conversion and storage based on robust fluoride-free self-assembled 1D niobium carbide in 3D nanowire network. Adv Sci. 2020;7(10):1903680.

[169] Shi H, Zhang P, Liu Z, et al. Ambient-stable two-dimensional titanium carbide (MXene) enabled by iodine etching. Angew Chem Int Ed. 2021;60(16):8689-8693.

[170] Jiang L, Zhou D, Yang J, et al. 2D single- and few-layered MXenes: synthesis, applications and perspectives. J Mater Chem A. 2022;10(26):13651-13672.

[171] Shuck CE, Sarycheva A, Anayee M, et al. Scalable synthesis of Ti₃C₂T_x MXene. Adv Eng Mater. 2020;22(3):1901241.

[172] Sindhu AS, Shinde NB, Harish S, Navaneethan M, Eswaran SK. Recoverable and reusable visible-light photocatalytic performance of CVD-grown atomically thin MoS₂ films. Chemosphere. 2022;287(Pt 4):132347.

[173] Mazzanti S, Manfredi G, Barker AJ, Antonietti M, Savateev A, Giusto P. Carbon nitride thin films as all-in-one technology for photocatalysis. ACS Catal. 2021;11(17):11109-11116.

[174] Zhang Z, Gedeon H, Cheng Z, et al. Layer-stacking, defects, and robust superconductivity on the Mo-terminated surface of ultrathin Mo2C flakes grown by CVD. Nano Lett. 2019;19(5):3327-3335.

[175] Geng D, Zhao X, Chen Z, et al. Direct synthesis of large-area 2D Mo₂C on in situ grown graphene. Adv Mater. 2017;29(35):1700072.

[176] Chen Z-Y, Shi M-Q, Ma C-A, Chu Y-Q, Zhu A-J. Simple, green self-construction approach for large-scale synthesis of hollow, needle-like tungsten carbide. Powder Technol. 2013;235:467-474.

[177] Zhu K, Jin Y, Du F, et al. Synthesis of Ti₂CT_x MXene as electrode materials for symmetric supercapacitor with capable volumetric capacitance. J Energy Chem. 2018;31:11-18.

[178] Liu Y, Zhang X, Dong S, Ye Z, Wei Y. Synthesis and tribological property of Ti₃C₂T_x nanosheets. J Mater Sci. 2017;52(4):2200-2209.

[179] Ying Y, Liu Y, Wang X, et al. Two-dimensional titanium carbide for efficiently reductive removal of highly toxic chromium (VI) from water. ACS Appl Mater Interfaces. 2015;7(3):1795-1803.

[180] Alhabeb M, Maleski K, Mathis TS, et al. Selective etching of silicon from Ti₃SiC₂ (MAX) to obtain 2D titanium carbide (MXene). Angew Chem. 2018;130(19):5542-5546.

[181] Naguib M, Halim J, Lu J, et al. New two-dimensional niobium and vanadium carbides as promising materials for Li-ion batteries. J Am Chem Soc. 2013;135(43):15966-15969.

[182] VahidMohammadi A, Hadjikhani A, Shahbazmohamadi S, Beidaghi M. Two-dimensional vanadium carbide (MXene) as a high-capacity cathode material for rechargeable aluminum batteries. ACS Nano. 2017;11(11):11135-11144.

[183] Wang X, Lin S, Tong H, et al. Two-dimensional V₄C₃ MXene as high-performance electrode materials for supercapacitors. Electrochim Acta. 2019;307:414-421.

[184] Naguib M, Mashtalir O, Carle J, et al. Two-dimensional transition metal carbides. ACS Nano. 2012;6(2):1322-1331.

[185] Halim J, Kota S, Lukatskaya MR, et al. Synthesis and characterization of 2D molybdenum carbide (MXene). Adv Funct Mater. 2016;26(18):3118-3127.

[186] Anasori B, Xie Y, Beidaghi M, et al. Two-dimensional, ordered, double transition metals carbides (MXenes). ACS Nano. 2015;9(10):9507-9516.

[187] Meshkian R, Tao Q, Dahlqvist M, Lu J, Hultman L, Rosen J. Theoretical stability and materials synthesis of a chemically ordered MAX phase, Mo₂ScAlC₂, and its two-dimensional derivate Mo₂ScC₂ MXene. Acta Mater. 2017;125:476-480.

[188] Yang J, Naguib M, Ghidiu M, et al. Two-dimensional Nb-based M₄C₃ solid solutions (MXenes). J Am Ceram Soc. 2016;99(2):660-666.

[189] Cai P, He Q, Wang L, et al. Two-dimensional Nb-based M₄C₃T_x MXenes and their sodium storage performances. Ceram Int. 2019;45(5):5761-5767.

[190] Zhou J, Zha X, Zhou X, et al. Synthesis and electrochemical properties of two-dimensional hafnium carbide. ACS Nano. 2017;11(4):3841-3850.

[191] Zhou J, Zha X, Chen FY, et al. A two-dimensional zirconium carbide by selective etching of Al₃C₃ from nanolaminated Zr₃Al₃C₅. Angew Chem Int Ed. 2016;55(16):5008-5013.

[192] Kajiyama S, Szabova L, Iinuma H, et al. Enhanced Li-ion accessibility in MXene titanium carbide by steric chloride termination. Adv Energy Mater. 2017;7(9):1601873.

[193] Wang X, Garnero C, Rochard G, et al. A new etching environment (FeF₃/HCl) for the synthesis of two-dimensional titanium carbide MXenes: a route towards selective reactivity vs. water. J Mater Chem A. 2017;5(41):22012-22023.

[194] Sang X, Xie Y, Lin M-W, et al. Atomic defects in monolayer titanium carbide (Ti₃C₂T_x) MXene. ACS Nano. 2016;10(10):9193-9200.

[195] Maleski K, Mochalin VN, Gogotsi Y. Dispersions of two-dimensional titanium carbide MXene in organic solvents. Chem Mater. 2017;29(4):1632-1640.

[196] Wu J, Wang Y, Zhang Y, et al. Highly safe and ionothermal synthesis of Ti₃C₂ MXene with expanded interlayer spacing for enhanced lithium storage. J Energy Chem. 2020;47:203-209.

[197] Guan Y, Jiang S, Cong Y, et al. A hydrofluoric acid-free synthesis of 2D vanadium carbide (V₂C) MXene for supercapacitor electrodes. 2D Mater. 2020;7(2):025010.

[198] Xiao J, Wen J, Zhao J, Ma X, Gao H, Zhang X. A safe etching route to synthesize highly crystalline Nb₂CT_x MXene for high-performance asymmetric supercapacitor applications. Electrochim Acta. 2020;337:135803.

[199] Li Y, Shao H, Lin Z, et al. A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte. Nat Mater. 2020;19(8):894-899.

[200] Li M, Li X, Qin G, et al. Halogenated Ti₃C₂ MXenes with electrochemically active terminals for high-performance zinc ion batteries. ACS Nano. 2021;15(1):1077-1085.

[201] Dong H, Xiao P, Jin N, Wang B, Liu Y, Lin Z. Molten salt derived Nb₂CT_x MXene anode for Li-ion batteries. ChemElectroChem. 2021;8(5):957-962.

[202] Li G, Tan L, Zhang Y, Wu B, Li L. Highly efficiently delaminated single-layered MXene nanosheets with large lateral size. Langmuir. 2017;33(36):9000-9006.

[203] Xie X, Xue Y, Li L, et al. Surface Al leached Ti₃AlC₂ as a substitute for carbon for use as a catalyst support in a harsh corrosive electrochemical system. Nanoscale. 2014;6(19):11035-11040.

[204] Sun W, Shah SA, Chen Y, et al. Electrochemical etching of Ti₂AlC to Ti₂CT_x (MXene) in low-concentration hydrochloric acid solution. J Mater Chem A. 2017;5(41):21663-21668.

[205] Pang S-Y, Wong Y-T, Yuan S, et al. Universal strategy for HF-free facile and rapid synthesis of two-dimensional MXenes as multifunctional energy materials. J Am Chem Soc. 2019;141(24):9610-9616.

[206] Yang S, Zhang P, Wang F, et al. Fluoride-free synthesis of two-dimensional titanium carbide (MXene) using a binary aqueous system. Angew Chem. 2018;130(47):15717-15721.

[207] Jawaid A, Hassan A, Neher G, et al. Halogen etch of Ti₃AlC₂ MAX phase for MXene fabrication. ACS Nano. 2021;15(2):2771-2777.

[208] Wang Z, Kochat V, Pandey P, et al. Metal immiscibility route to synthesis of ultrathin carbides, borides, and nitrides. Adv Mater. 2017;29(29):1700364.

[209] Kim K-W, Kim B, Lee S, et al. Growth of NbC thin film using CH₄ as a carbon source and reducing agent. Coatings. 2018;8(11):379.

[210] Wang K-F, Sun G-D, Wu Y-D, Zhang G-H. Fabrication of ultrafine and high-purity tungsten carbide powders via a carbothermic reduction–carburization process. J Alloys Compd. 2019;784:362-369.

[211] Miroshnichenko MN, Kolosov VN. Production of tungsten carbide powder by the reaction of tungsten with ethanol. J Phys: Conf Ser. 2021;1942(1):012009.

[212] Gupta A, Mittal M, Singh MK, Suib SL, Pandey OP. Low-temperature synthesis of NbC/C nano-composites as visible light photoactive catalyst. Sci Rep. 2018;8(1):13597.

[213] Srivastava P, Mishra A, Mizuseki H, Lee K-R, Singh AK. Mechanistic insight into the chemical exfoliation and functionalization of Ti₃C₂ MXene. ACS Appl Mater Interfaces. 2016;8(36):24256-24264.

[214] Alhabeb M, Maleski K, Anasori B, et al. Guidelines for synthesis and processing of two-dimensional titanium carbide (Ti₃C₂T_x MXene). Chem Mater. 2017;29(18):7633-7644.

[215] Halim J, Lukatskaya MR, Cook KM, et al. Transparent conductive two-dimensional titanium carbide epitaxial thin films. Chem Mater. 2014;26(7):2374-2381.

[216] Rasheed PA, Pandey RP, Gomez T, Naguib M, Mahmoud KA. Large interlayer spacing Nb₄C₃T_x (MXene) promotes the ultrasensitive electrochemical detection of Pb²⁺ on glassy carbon electrodes. RSC Adv. 2020;10(41):24697-24704.

[217] Feng A, Yu Y, Jiang F, et al. Fabrication and thermal stability of NH₄HF₂-etched Ti₃C₂ MXene. Ceram Int. 2017;43(8):6322-6328.

[218] Qin Y, Zha X-H, Bai X, et al. Structural, mechanical and electronic properties of two-dimensional chlorine-terminated transition metal carbides and nitrides. J Phys Condens Matter. 2020;32(13):135302.

[219] Kamysbayev V, Filatov AS, Hu H, et al. Covalent surface modifications and superconductivity of two-dimensional metal carbide MXenes. Science. 2020;369(6506):979-983.

[220] Hantanasirisakul K, Zhao M-Q, Urbankowski P, et al. Fabrication of Ti₃C₂T_x MXene transparent thin films with tunable optoelectronic properties. Adv Electron Mater. 2016;2(6):1600050.

[221] He M, Shi H, Wang P, Sun X, Gao B. Porous molybdenum carbide nanostructures synthesized on carbon cloth by CVD for efficient hydrogen production. Chem A Eur J. 2019;25(70):16106-16113.

[222] Wolden CA, Pickerell A, Gawai T, Parks S, Hensley J, Way JD. Synthesis of β-Mo₂C thin films. ACS Appl Mater Interfaces. 2011;3(2):517-521.

[223] Zhang Y, Zang J, Han C, et al. Molybdenum oxide and molybdenum carbide coated carbon black as an electrocatalyst for hydrogen evolution reaction in acidic media. Int J Hydrogen Energy. 2017;42(44):26985-26994.

[224] Yan Q, Lu Y, To F, Li Y, Yu F. Synthesis of tungsten carbide nanoparticles in biochar matrix as a catalyst for dry reforming of methane to syngas. Catal Sci Technol. 2015;5(6):3270-3280.

[225] Yi S-S, Yan J-M, Wulan B-R, Jiang Q. Efficient visible-light-driven hydrogen generation from water splitting catalyzed by highly stable CdS@Mo₂C–C core–shell nanorods. J Mater Chem A. 2017;5(30):15862-15868.

[226] Li Z, Wang S, Wu J, Zhou W. Recent progress in defective TiO₂ photocatalysts for energy and environmental applications. Renew Sustain Energy Rev. 2022;156:111980.

[227] Mishra A, Mehta A, Basu S, Shetti NP, Reddy KR, Aminabhavi TM. Graphitic carbon nitride (g-C₃N₄)-based metal-free photocatalysts for water splitting: a review. Carbon. 2019;149:693-721.

[228] Ong W-J, Putri LK, Tan L-L, Chai S-P, Yong S-T. Heterostructured AgX/g-C₃N₄ (X=Cl and Br) nanocomposites via a sonication-assisted deposition-precipitation approach: emerging role of halide ions in the synergistic photocatalytic reduction of carbon dioxide. Appl Catal B. 2016;180:530-543.

[229] Tan X-Q, Ng S-F, Mohamed AR, Ong W-J. Point-to-face contact heterojunctions: interfacial design of 0D nanomaterials on 2D g-C₃N₄ towards photocatalytic energy applications. Carbon Energy. 2022;4(5):665-730.

[230] Chong DS, Foo JJ, Tan X-Q, et al. Evolutionary face-to-face 2D/2D bismuth-based heterojunction: the quest for sustainable photocatalytic applications. Appl Mater Today. 2022;29:101636.

[231] Ling C, Shi L, Ouyang Y, Chen Q, Wang J. Transition metal-promoted V₂CO₂ (MXenes): a new and highly active catalyst for hydrogen evolution reaction. Adv Sci. 2016;3(11):1600180.

[232] Su T, Hood ZD, Naguib M, et al. Monolayer Ti₃C₂T_x as an effective co-catalyst for enhanced photocatalytic hydrogen production over TiO₂. ACS Appl Energy Mater. 2019;2(7):4640-4651.

[233] Ding M, Xiao R, Zhao C, et al. Evidencing interfacial charge transfer in 2D CdS/2D MXene schottky heterojunctions toward high-efficiency photocatalytic hydrogen production. Solar RRL. 2021;5(2):2000414.

[234] Ruan D, Fujitsuka M, Majima T. Exfoliated Mo₂C nanosheets hybridized on CdS with fast electron transfer for efficient photocatalytic H₂ production under visible light irradiation. Appl Catal B. 2020;264:118541.

[235] Zeng G, Cao Y, Wu Y, et al. Cd_0.5Zn_0.5S/Ti₃C₂ MXene as a Schottky catalyst for highly efficient photocatalytic hydrogen evolution in seawater. Appl Mater Today. 2021;22:100926.

[236] Kumaravel V, Mathew S, Bartlett J, Pillai SC. Photocatalytic hydrogen production using metal doped TiO₂: a review of recent advances. Appl Catal B. 2019;244:1021-1064.

[237] Su T, Peng R, Hood ZD, et al. One-step synthesis of Nb₂O₅/C/Nb₂C (MXene) composites and their use as photocatalysts for hydrogen evolution. ChemSusChem. 2018;11(4):688-699.

[238] Wang H, Chen L, Sun Y, et al. Ti₃C₂ Mxene modified SnNb₂O₆ nanosheets Schottky photocatalysts with directed internal electric field for tetracycline hydrochloride removal and hydrogen evolution. Sep Purif Technol. 2021;265:118516.

[239] Wang L, Li Y, Wu C, Li X, Shao G, Zhang P. Tracking charge transfer pathways in SrTiO₃/CoP/Mo₂C nanofibers for enhanced photocatalytic solar fuel production. Chin J Catal. 2022;43(2):507-518.

[240] Shao M, Shao Y, Chai J, et al. Synergistic effect of 2D-Ti₂C and g-C₃N₄ for efficient photocatalytic hydrogen production. J Mater Chem A. 2017;5(32):16748-16756.

[241] Chen K, Zhang S, Peng W, Qian X, Huang J. Modification of g-C₃N₄ quantum dots by Ni–Ni₃C@C nanoparticles for hydrogen production. J Phys Chem Solids. 2019;133:100-107.

[242] Ling GZS, Ng S-F, Ong W-J. Tailor-engineered 2D cocatalysts: harnessing electron–hole redox center of 2D g-C₃N₄ photocatalysts toward solar-to-chemical conversion and environmental purification. Adv Funct Mater. 2022;32(29):2111875.

[243] Ling GZS, Oh VB-Y, Haw CY, Tan L-L, Ong W-J. g-C₃N₄ photocatalysts: utilizing electron-hole pairs for boosted redox capability in water splitting. Energy Mater Adv. 2023;4:1-27.

[244] Li Y, Ding L, Guo Y, Liang Z, Cui H, Tian J. Boosting the photocatalytic ability of g-C₃N₄ for hydrogen production by Ti₃C₂ MXene quantum dots. ACS Appl Mater Interfaces. 2019;11(44):41440-41447.

[245] An X, Wang W, Wang J, Duan H, Shi J, Yu X. The synergetic effects of Ti₃C₂ MXene and Pt as co-catalysts for highly efficient photocatalytic hydrogen evolution over g-C₃N₄. Phys Chem Chem Phys. 2018;20(16):11405-11411.

[246] Huang K, Li C, Zhang X, Wang L, Wang W, Meng X. Self-assembly synthesis of phosphorus-doped tubular g-C₃N₄/Ti₃C₂ MXene Schottky junction for boosting photocatalytic hydrogen evolution. Green Energy Environ. 2023;8(1):233-245.

[247] Chowdhury P, Malekshoar G, Ray A. Dye-sensitized photocatalytic water splitting and sacrificial hydrogen generation: current status and future prospects. Inorganics. 2017;5(2):34.

[248] Sun Y, Sun Y, Meng X, et al. Eosin Y-sensitized partially oxidized Ti₃C₂ MXene for photocatalytic hydrogen evolution. Catal Sci Technol. 2019;9(2):310-315.

[249] Li T, Wang X, Jin Z. MoC quantum dots modified by CeO₂ dispersed in ultra-thin carbon films for efficient photocatalytic hydrogen evolution. Mol Catal. 2021;513:111829.

[250] Jin Z, Wang H, Ma Q. High electron conductivity of Ni/Ni₃C nanoparticles anchored on C-rich graphitic carbon nitride for obviously improving hydrogen generation. Ind Eng Chem Res. 2020;59(19):8974-8983.

[251] Zhang W, Li W, Li Y, Peng S, Xu Z. One-step synthesis of nickel oxide/nickel carbide/graphene composite for efficient dye-sensitized photocatalytic H₂ evolution. Catal Today. 2019;335:326-332.

[252] Yan T, Wang Y, Cao Y, Liu H, Jin Z. MoC quantum dots embedded in ultra-thin carbon film coupled with 3D porous g-C₃N₄ for enhanced visible-light-driven hydrogen evolution. Appl Catal A. 2022;630:118457.

[253] Zhang W, Zou Y, Mei X, Li Y, Peng S, Xu J. Facile synthesis of Co₂(OH)₃Cl/cobalt carbide/reduced graphene oxide composites for enhanced dye-sensitized photocatalytic H₂ evolution. Sustain Energy Fuels. 2020;4(12):6181-6187.

[254] Li T, Yan T, Jin Z. Design and preparation of a ternary MoC-QDs/C/Mo-S heterojunction for enhanced eosin Y-sensitized photocatalytic hydrogen evolution. New J Chem. 2021;45(27):11905-11917.

[255] Chen Y-H, Qi M-Y, Li Y-H, et al. Activating two-dimensional Ti₃C₂T_x-MXene with single-atom cobalt for efficient CO₂ photoreduction. Cell Rep Phys Sci. 2021;2(3):100371.

[256] Tayyab M, Liu Y, Min S, et al. Simultaneous hydrogen production with the selective oxidation of benzyl alcohol to benzaldehyde by a noble-metal-free photocatalyst VC/CdS nanowires. Chin J Catal. 2022;43(4):1165-1175.

[257] Li F, Wang Y, Du J, Zhu Y, Xu C, Sun L. Simultaneous oxidation of alcohols and hydrogen evolution in a hybrid system under visible light irradiation. Appl Catal B. 2018;225:258-263.

[258] Kampouri S, Stylianou KC. Dual-functional photocatalysis for simultaneous hydrogen production and oxidation of organic substances. ACS Catal. 2019;9(5):4247-4270.

[259] Xia B, Zhang Y, Shi B, Ran J, Davey K, Qiao S-Z. Photocatalysts for hydrogen evolution coupled with production of value-added chemicals. Small Methods. 2020;4(7):2000063.

[260] Li J-Y, Li Y-H, Zhang F, Tang Z-R, Xu Y-J. Visible-light-driven integrated organic synthesis and hydrogen evolution over 1D/2D CdS-Ti₃C₂T_x MXene composites. Appl Catal B. 2020;269:118783.

[261] Tao J, Wang M, Liu G, et al. Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd_0.5Zn_0.5S/2D Ti₃C₂ Schottky heterojunction. J Adv Ceram. 2022;11(7):1117-1130.

[262] Druffel DL, Lanetti MG, Sundberg JD, et al. Synthesis and electronic structure of a 3D crystalline stack of MXene-like sheets. Chem Mater. 2019;31(23):9788-9796.

[263] Li Y, Yang S, Liang Z, Xue Y, Cui H, Tian J. 1T-MoS₂ nanopatch/Ti₃C₂ MXene/TiO₂ nanosheet hybrids for efficient photocatalytic hydrogen evolution. Mater Chem Front. 2019;3(12):2673-2680.

[264] Dong H, Zhang X, Zuo Y, et al. 2D Ti₃C₂ as electron harvester anchors on 2D g-C₃N₄ to create boundary edge active sites for boosting photocatalytic performance. Appl Catal A. 2020;590:117367.

[265] Li Z, Zhang H, Wang L, et al. 2D/2D BiOBr/Ti₃C₂ heterojunction with dual applications in both water detoxification and water splitting. J Photochem Photobiol A. 2020;386:112099.

[266] Yao Z, Sun H, Sui H, Liu X. 2D/2D heterojunction of R-scheme Ti₃C₂ MXene/MoS₂ nanosheets for enhanced photocatalytic performance. Nanoscale Res Lett. 2020;15(1):78.

[267] Li Y, Yin Z, Ji G, et al. 2D/2D/2D heterojunction of Ti₃C₂ MXene/MoS₂ nanosheets/TiO₂ nanosheets with exposed (001) facets toward enhanced photocatalytic hydrogen production activity. Appl Catal B. 2019;246:12-20.

[268] Liu D, Li C, Ge J, et al. 3D interconnected g-C₃N₄ hybridized with 2D Ti₃C₂ MXene nanosheets for enhancing visible light photocatalytic hydrogen evolution and dye contaminant elimination. Appl Surf Sci. 2022;579:152180.

[269] Dang Y, Feng L, Hu W, Wang W, Zhang Q, Ma B. A 3D flower-like WC with large capacitance as efficient co-catalyst in photocatalytic H₂ evolution. Int J Hydrogen Energy. 2021;46(79):39251-39261.

[270] Dong J, Shi Y, Huang C, Wu Q, Zeng T, Yao W. A new and stable Mo-Mo₂C modified g-C₃N₄ photocatalyst for efficient visible light photocatalytic H₂ production. Appl Catal B. 2019;243:27-35.

[271] Liu Y, Zhang H, Jiang Y. A new noble-metal-free co-catalyst V₈C₇ on g-C₃N₄ with enhanced photocatalytic H₂ evolution activity. Appl Catal A. 2021;625:118341.

[272] Li Y, Liu Y, Sun X, et al. Aggregate-forming semi-synthetic chlorophyll derivatives/Ti₃C₂T MXene hybrids for photocatalytic hydrogen evolution. Dyes Pigm. 2021;194:109583.

[273] Zhang J, Liu M, Wang Y, Shi F. Au/MoS₂/Ti₃C₂ composite catalyst for efficient photocatalytic hydrogen evolution. CrystEngComm. 2020;22(21):3683-3691.

[274] Tahir M. Binary Ni₂P/Ti₃C₂ multilayer cocatalyst anchored TiO₂ nanocomposite with etchant/oxidation grown TiO₂ NPs for enhancing photocatalytic H₂ production. Energy Fuels. 2021;35(17):14197-14211.

[275] Cheng L, Chen Q, Li J, Liu H. Boosting the photocatalytic activity of CdLa₂S₄ for hydrogen production using Ti₃C₂ MXene as a co-catalyst. Appl Catal B. 2020;267:118379.

[276] Yang Z, Li M, Chen S, et al. Cocatalyst engineering with robust tunable carbon-encapsulated Mo-rich Mo/Mo₂C heterostructure nanoparticle for efficient photocatalytic hydrogen evolution. Adv Funct Mater. 2023;33(14):2212746.

[277] Pan Y, Zhou T, Han J, et al. CdS quantum dots and tungsten carbide supported on anatase–rutile composite TiO₂ for highly efficient visible-light-driven photocatalytic H₂ evolution from water. Catal Sci Technol. 2016;6(7):2206-2213.

[278] Li Y, Liu Y, Zheng T, Sasaki S, Tamiaki H, Wang X-F. Chlorophyll derivative sensitized monolayer Ti₃C₂T_x MXene nanosheets for photocatalytic hydrogen evolution. J Photochem Photobiol A. 2022;427:113792.

[279] Li Y, Zheng T, Liu Y, et al. Chlorophyll derivatives/MXene hybrids for photocatalytic hydrogen evolution: dependence of performance on the central coordinating metals. Int J Hydrogen Energy. 2022;47(6):3824-3833.

[280] Li Y, Sun Y, Zheng T, et al. Chlorophyll-based organic heterojunction on Ti₃C₂T_x MXene nanosheets for efficient hydrogen production. Chem A Eur J. 2021;27(16):5277-5282.

[281] Li J, Li J, Wu C, et al. Crystalline carbon nitride anchored on MXene as an ordered Schottky heterojunction photocatalyst for enhanced visible-light hydrogen evolution. Carbon. 2021;179:387-399.

[282] Huang Z, Chen H, He X, et al. Constructing a WC/NCN Schottky junction for rapid electron transfer and enrichment for highly efficient photocatalytic hydrogen evolution. ACS Appl Mater Interfaces. 2021;13(39):46598-46607.

[283] Shen R, Ding Y, Li S, et al. Constructing low-cost Ni₃C/twin-crystal Zn_0.5Cd_0.5S heterojunction/homojunction nanohybrids for efficient photocatalytic H₂ evolution. Chin J Catal. 2021;42(1):25-36.

[284] Yao Z, Sun H, Sui H, Liu X. Construction of BPQDs/Ti₃C₂@TiO₂ composites with favorable charge transfer channels for enhanced photocatalytic activity under visible light irradiation. Nanomaterials. 2020;10(3):452.

[285] Lin P, Shen J, Yu X, Liu Q, Li D, Tang H. Construction of Ti₃C₂ MXene/O-doped g-C₃N₄ 2D-2D Schottky-junction for enhanced photocatalytic hydrogen evolution. Ceram Int. 2019;45(18):24656-24663.

[286] Song Y, Xia K, Gong Y, et al. Controllable synthesized heterostructure photocatalyst Mo₂C@C/2D g-C₃N₄: enhanced catalytic performance for hydrogen production. Dalton Trans. 2018;47(41):14706-14712.

[287] Zhao X, Chen J, Zhao C, et al. Construction ZnIn₂S₄/Ti₃C₂ of 2D/2D heterostructures with enhanced visible light photocatalytic activity: a combined experimental and first-principles DFT study. Appl Surf Sci. 2021;570:151183.

[288] Huang W, Li Z, Wu C, Zhang H, Sun J, Li Q. Delaminating Ti₃C₂ MXene by blossom of ZnIn₂S₄ microflowers for noble-metal-free photocatalytic hydrogen production. J Mater Sci Technol. 2022;120:89-98.

[289] Kang J, Byun S, Kim S, et al. Design of three-dimensional hollow-sphere architecture of Ti₃C₂T_x MXene with graphitic carbon nitride nanoshells for efficient photocatalytic hydrogen evolution. ACS Appl Energy Mater. 2020;3(9):9226-9233.

[290] Ai Z, Shao Y, Chang B, Huang B, Wu Y, Hao X. Effective orientation control of photogenerated carrier separation via rational design of a Ti₃C₂(TiO₂)@CdS/MoS₂ photocatalytic system. Appl Catal B. 2019;242:202-208.

[291] Li Z, Huang W, Liu J, Lv K, Li Q. Embedding CdS@Au into ultrathin Ti_3–xC₂T_y to build dual Schottky barriers for photocatalytic H₂ production. ACS Catal. 2021;11(14):8510-8520.

[292] Tian P, He X, Zhao L, et al. Enhanced charge transfer for efficient photocatalytic H₂ evolution over UiO-66-NH₂ with annealed Ti₃C₂T_x MXenes. Int J Hydrogen Energy. 2019;44(2):788-800.

[293] Shi L, Wu C, Wang Y, et al. Rational design of coordination bond connected metal-organic frameworks/MXene hybrids for efficient solar water splitting. Adv Funct Mater. 2022;32(30):2202571.

[294] Ma X, Li W, Ren C, et al. Fabrication of novel noble-metal-free ZnIn₂S₄/WC Schottky junction heterojunction photocatalyst: efficient charge separation, increased active sites and low hydrogen production overpotential for boosting visible-light H₂ evolution. J Alloys Compd. 2022;901:163709.

[295] Yin J, Zhan F, Jiao T, et al. Facile preparation of self-assembled MXene@Au@CdS nanocomposite with enhanced photocatalytic hydrogen production activity. Sci China Mater. 2020;63(11):2228-2238.

[296] Xi Q, Yue X, Feng J, et al. Facile synthesis of 2D Bi₄O₅Br₂/2D thin layer-Ti₃C₂ for improved visible-light photocatalytic hydrogen evolution. J Solid State Chem. 2020;289:121470.

[297] Xie Y, Rahman MM, Kareem S, et al. Facile synthesis of CuS/MXene nanocomposites for efficient photocatalytic hydrogen generation. CrystEngComm. 2020;22(11):2060-2066.

[298] Irfan RM, Tahir MH, Nadeem M, et al. Fe₃C/CdS as noble-metal-free composite photocatalyst for highly enhanced photocatalytic H₂ production under visible light. Appl Catal A. 2020;603:117768.

[299] Liu Z, Zhou Y, Yang L, Yang R. Green preparation of in-situ oxidized TiO₂/Ti₃C₂ heterostructure for photocatalytic hydrogen production. Adv Powder Technol. 2021;32(12):4857-4861.

[300] Liu J, Wang P, Fan J, Yu H, Yu J. Hetero-phase MoC-Mo₂C nanoparticles for enhanced photocatalytic H₂-production activity of TiO₂. Nano Res. 2021;14(4):1095-1102.

[301] Zhang M, Qin J, Rajendran S, Zhang X, Liu R. Heterostructured d-Ti₃C₂/TiO₂/g-C₃N₄ nanocomposites with enhanced visible-light photocatalytic hydrogen production activity. ChemSusChem. 2018;11(24):4226-4236.

[302] Peng C, Wei P, Li X, et al. High-efficiency photocatalytic hydrogen production over ternary Cu/TiO₂@Ti₃C₂T_x enabled by low-work-function 2D titanium carbide. Nano Energy. 2018;53:97-107.

[303] Qin X, Cao R, Gong W, et al. Hydrothermal growth of ZnCdS/TiO₂ nanoparticles on the surface of the Ti₃C₂ MXene sheet to enhance photocatalytic performance under visible light. J Solid State Chem. 2022;306:122750.

[304] Lin K, Feng L, Li D, Zhang J, Wang W, Ma B. Improved photocatalytic hydrogen evolution on (Ru/WC)/CdS via modulating the transferring paths of photo-excited electrons. Appl Catal B. 2021;286:119880.

[305] Huang J, Tao J, Liu G, Lu L, Tang H, Qiao G. In situ construction of 1D CdS/2D Nb₂CT_x MXene Schottky heterojunction for enhanced photocatalytic hydrogen production activity. Appl Surf Sci. 2022;573:151491.

[306] Tie L, Yang S, Yu C, et al. In situ decoration of ZnS nanoparticles with Ti₃C₂ MXene nanosheets for efficient photocatalytic hydrogen evolution. J Colloid Interface Sci. 2019;545:63-70.

[307] Xiao R, Zhao C, Zou Z, et al. In situ fabrication of 1D CdS nanorod/2D Ti₃C₂ MXene nanosheet Schottky heterojunction toward enhanced photocatalytic hydrogen evolution. Appl Catal B. 2020;268:118382.

[308] Li J, Zhao L, Wang S, Li J, Wang G, Wang J. In situ fabrication of 2D/3D g-C₃N₄/Ti₃C₂ (MXene) heterojunction for efficient visible-light photocatalytic hydrogen evolution. Appl Surf Sci. 2020;515:145922.

[309] Kai C-M, Kong C, Zhang F-J, Li D-C, Wang Y-R, Oh W-C. In situ growth of CdS spherical nanoparticles/Ti₃C₂ MXene nanosheet heterojunction with enhanced photocatalytic hydrogen evolution. J Korean Ceram Soc. 2022;59:302-311.

[310] Liu J, Wang P, Fan J, Yu H, Yu J. In situ synthesis of Mo₂C nanoparticles on graphene nanosheets for enhanced photocatalytic H₂-production activity of TiO₂. ACS Sustain Chem Eng. 2021;9(10):3828-3837.

[311] Yang F, Liu D, Li Y, Cheng L, Ye J. Lithium incorporation assisted synthesis of ultra-small Mo₂C nanodots as efficient photocatalytic H₂ evolution cocatalysts. Chem Eng J. 2020;399:125794.

[312] Guo Q, Liang F, Gao X-Y, et al. Metallic Co₂C: a promising co-catalyst to boost photocatalytic hydrogen evolution of colloidal quantum dots. ACS Catal. 2018;8(7):5890-5895.

[313] Ma B, Xu H, Lin K, et al. Mo₂C as non-noble metal co-catalyst in Mo₂C/CdS composite for enhanced photocatalytic H₂ evolution under visible light irradiation. ChemSusChem. 2016;9(8):820-824.

[314] Jin S, Shi Z, Jing H, et al. Mo₂C-MXene/CdS heterostructures as visible-light photocatalysts with an ultrahigh hydrogen production rate. ACS Appl Energy Mater. 2021;4(11):12754-12766.

[315] Zhang J, Xing C, Shi F. MoS₂/Ti₃C₂ heterostructure for efficient visible-light photocatalytic hydrogen generation. Int J Hydrogen Energy. 2020;45(11):6291-6301.

[316] Lei Y, Wu X, Li S, Huang J, Ng KH, Lai Y. Noble-metal-free metallic MoC combined with CdS for enhanced visible-light-driven photocatalytic hydrogen evolution. J Clean Prod. 2021;322:129018.

[317] Li D, Zhou C, Liang X, et al. Noble-metal-free Mo₂C co-catalsyt modified perovskite oxide nanosheet photocatalysts with enhanced hydrogen evolution performance. Colloids Surf A. 2021;615:126252.

[318] Zhang H, Luo Z, Liu Y, Jiang Y. Noble-metal-free Ni₃C as co-catalyst on LaNiO₃ with enhanced photocatalytic activity. Appl Catal B. 2020;277:119166.

[319] Lei Y, Ng KH, Zhang Y, et al. One-pot loading of cadmium sulfide onto tungsten carbide for efficient photocatalytic H₂ evolution under visible light irradiation. Chem Eng J. 2022;434:134689.

[320] Xu W, Li X, Peng C, et al. One-pot synthesis of Ru/Nb₂O₅@Nb₂C ternary photocatalysts for water splitting by harnessing hydrothermal redox reactions. Appl Catal B. 2022;303:120910.

[321] Li Y, Ding L, Yin S, et al. Photocatalytic H₂ evolution on TiO₂ assembled with Ti₃C₂ MXene and metallic 1T-WS₂ as co-catalysts. Nano Micro Lett. 2020;12(1):6.

[322] Pajares A, Wang Y, Kronenberg MJ, Ramírez de la Piscina P, Homs N. Photocatalytic H₂ production from ethanol aqueous solution using TiO₂ with tungsten carbide nanoparticles as co-catalyst. Int J Hydrogen Energy. 2020;45(40):20558-20567.

[323] Yang Y, Zhang D, Xiang Q. Plasma-modified Ti₃C₂T_x/CdS hybrids with oxygen-containing groups for high-efficiency photocatalytic hydrogen production. Nanoscale. 2019;11(40):18797-18805.

[324] Liu X, Wang B, Heng Q, et al. Promoted charge separation on 3D interconnected Ti₃C₂/MoS₂/CdS composite for enhanced photocatalytic H₂ production. Int J Hydrogen Energy. 2022;47(13):8284-8293.

[325] Yang W, Ma G, Fu Y, et al. Rationally designed Ti₃C₂ MXene@TiO₂/CuInS₂ Schottky/S-scheme integrated heterojunction for enhanced photocatalytic hydrogen evolution. Chem Eng J. 2022;429:132381.

[326] Peng C, Zhou T, Wei P, et al. Regulation of the rutile/anatase TiO₂ phase junction in-situ grown on –OH terminated Ti₃C₂T_x (MXene) towards remarkably enhanced photocatalytic hydrogen evolution. Chem Eng J. 2022;439:135685.

[327] Li H, Lv X, Li R, Tao X, Zheng Y. Stable and efficient Ti₃C₂ MXene/MAPbI₃-HI system for visible-light-driven photocatalytic HI splitting. J Power Sources. 2022;522:231006.

[328] Su T, Men C, Chen L, et al. Sulfur vacancy and Ti₃C₂T_x cocatalyst synergistically boosting interfacial charge transfer in 2D/2D Ti₃C₂T_x/ZnIn₂S₄ heterostructure for enhanced photocatalytic hydrogen evolution. Adv Sci. 2022;9(4):2103715.

[329] Zhong T, Yu Z, Jiang R, et al. Surface-activated Ti₃C₂T_x MXene cocatalyst assembled with CdZnS-formed 0D/2D CdZnS/Ti₃C₂-A₄₀ Schottky heterojunction for enhanced photocatalytic hydrogen evolution. Solar RRL. 2022;6(2):2100863.

[330] Chen R, Wang P, Chen J, Wang C, Ao Y. Synergetic effect of MoS₂ and MXene on the enhanced H₂ evolution performance of CdS under visible light irradiation. Appl Surf Sci. 2019;473:11-19.

[331] Li Y, Ding L, Liang Z, Xue Y, Cui H, Tian J. Synergetic effect of defects rich MoS₂ and Ti₃C₂ MXene as cocatalysts for enhanced photocatalytic H₂ production activity of TiO₂. Chem Eng J. 2020;383:123178.

[332] Xu F, Zhang D, Liao Y, et al. Synthesis and photocatalytic H₂-production activity of plasma-treated Ti₃C₂T_x MXene modified graphitic carbon nitride. J Am Ceram Soc. 2020;103(2):849-858.

[333] Li H, Sun B, Gao T, Li H, Ren Y, Zhou G. Ti₃C₂ MXene co-catalyst assembled with mesoporous TiO₂ for boosting photocatalytic activity of methyl orange degradation and hydrogen production. Chin J Catal. 2022;43(2):461-471.

[334] Tian P, He X, Zhao L, et al. Ti₃C₂ nanosheets modified Zr-MOFs with Schottky junction for boosting photocatalytic HER performance. Sol Energy. 2019;188:750-759.

[335] Sun X, Li Y, Wang X-F, et al. Ti₃C₂T_x MXene nanosheets hybridized with bacteriochlorin–carotenoid conjugates for photocatalytic hydrogen evolution. New J Chem. 2022;46(5):2166-2177.

[336] Dong G, Zhang Y, Wang Y, et al. Ti₃C₂ quantum dots modified 3D/2D TiO₂/g-C₃N₄ S-scheme heterostructures for highly efficient photocatalytic hydrogen evolution. ACS Appl Energy Mater. 2021;4(12):14342-14351.

[337] Chen X, Guo Y, Bian R, et al. Titanium carbide MXenes coupled with cadmium sulfide nanosheets as two-dimensional/two-dimensional heterostructures for photocatalytic hydrogen production. J Colloid Interface Sci. 2022;613:644-651.

[338] Li Y, Zhang D, Feng X, Liao Y, Wen Q, Xiang Q. Truncated octahedral bipyramidal TiO₂/MXene Ti₃C₂ hybrids with enhanced photocatalytic H₂ production activity. Nanoscale Adv. 2019;1(5):1812-1818.

[339] Xie F, Xi Q, Li H, et al. Two-dimensional/two-dimensional heterojunction-induced accelerated charge transfer for photocatalytic hydrogen evolution over Bi₅O₇Br/Ti₃C₂: electronic directional transport. J Colloid Interface Sci. 2022;617:53-64.

[340] Tong R, Sun Z, Wang X, Wang S, Pan H. Ultrafine WC_1–x nanocrystals: an efficient cocatalyst for the significant enhancement of photocatalytic hydrogen evolution on g-C₃N₄. J Phys Chem C. 2019;123(43):26136-26144.

[341] Yue X, Yi S, Wang R, Zhang Z, Qiu S. Well-controlled SrTiO₃@Mo₂C core-shell nanofiber photocatalyst: boosted photo-generated charge carriers transportation and enhanced catalytic performance for water reduction. Nano Energy. 2018;47:463-473.

[342] Shao M, Chen W, Ding S, et al. WX_y/g-C₃N₄ (WX_y = W₂C, WS₂, or W₂N) composites for highly efficient photocatalytic water splitting. ChemSusChem. 2019;12(14):3355-3362.

[343] Luo Z, Zhao X, Zhang H, Jiang Y. Zn_0.3Cd_0.7S nanorods loaded with noble-metal-free Ni₃C co-catalyst enhancing photocatalytic hydrogen evolution. Appl Catal A. 2019;582:117115.

[344] Wang Y, Mino L, Pellegrino F, Homs N, Ramírez de la Piscina P. Engineered Mo_xC/TiO₂ interfaces for efficient noble metal-free photocatalytic hydrogen production. Appl Catal B. 2022;318:121783.

[345] Wang Y, Liu C, Kong C, Zhang F. Defect MoS₂ and Ti₃C₂ nanosheets co-assisted CdS to enhance visible-light driven photocatalytic hydrogen production. Colloids Surf A. 2022;652:129746.

[346] Biswal L, Nayak S, Parida K. Rationally designed Ti₃C₂/N, S-TiO₂/g-C₃N₄ ternary heterostructure with spatial charge separation for enhanced photocatalytic hydrogen evolution. J Colloid Interface Sci. 2022;621:254-266.

[347] Guo Y, Zhang D, Wang M, et al. Synergistic modulation on atomic-level 2D/2D Ti₃C₂/Svac-ZnIn₂S₄ heterojunction for photocatalytic H₂ production. Colloids Surf A. 2022;648:129229.

[348] Peng C, Zhou T, Wei P, et al. Steering interfacial charge kinetics: synergizing cocatalyst roles of Ti₃C₂M_x (MXene) and NCDs for superior photocatalytic performance over TiO₂. Appl Surf Sci. 2022;599:154001.

[349] Huang J, Wang M, Zhang X, et al. Anchoring of 2D CdS on Nb₂CT_x MXene nanosheets for boosting photocatalytic H₂ evolution. J Alloys Compd. 2022;923:166256.

[350] Liu W, Zhang D, Wang R, Zhang Z, Qiu S. 2D/2D interface engineering promotes charge separation of Mo₂C/g-C₃N₄ nanojunction photocatalysts for efficient photocatalytic hydrogen evolution. ACS Appl Mater Interfaces. 2022;14(28):31782-31791.

[351] Du M, Li L, Ji S, et al. In situ growth of 2D ZnIn₂S₄ nanosheets on sulfur-doped porous Ti₃C₂T_x MXene 3D multi-functional architectures for photocatalytic H₂ evolution. J Mater Chem C. 2022;10(29):10636-10644.

[352] Zhou X, Tian Y, Luo J, et al. MoC quantum dots@N-doped-carbon for low-cost and efficient hydrogen evolution reaction: from electrocatalysis to photocatalysis. Adv Funct Mater. 2022;32(27):2201518.

[353] Du J, Shen Y, Yang F, et al. In situ construction of an α-MoC/g-C₃N₄ Mott–Schottky heterojunction with high-speed electron transfer channel for efficient photocatalytic H₂ evolution. Inorg Chem Front. 2023;10(3):832-840.

[354] Liu J, Wang P, Gao L, Wang X, Yu H. In situ sulfuration synthesis of heterostructure MoS₂-Mo₂C@C for boosting the photocatalytic H₂ production activity of TiO₂. J Mater Chem C. 2022;10(8):3121-3128.

[355] Wei T, Zhang T, Jin Z, Li F, Xu L. Fabrication of nanocomposite MoC-Mo₂C@C/Cd_0.5Zn_0.5S: promoted electron migration and improved photocatalytic hydrogen evolution. Dalton Trans. 2022;51(30):11397-11403.

[356] Tan M, Yu C, Yao J, et al. The 2D van der Waals heterojunction MoC@NG@CN for enhanced photocatalytic hydrogen production. J Mater Chem A. 2023;11(10):5350-5358.

[357] Wei P, Chen Y, Zhou T, et al. Manipulation of charge-transfer kinetics via Ti₃C₂T_x(T = −O) quantum dot and N-doped carbon dot coloading on CdS for photocatalytic hydrogen production. ACS Catal. 2023;13(1):587-600.

[358] Miao B, Zhang Y, Chen Q, et al. Highly enhanced photocatalytic hydrogen production performance of heterostructured Ti₃C₂/TiO₂/rGO composites. Langmuir. 2022;38(50):15579-15591.

[359] Yi W-J, Du X, Zhang M, et al. Rational distribution of Ru nanodots on 2D Ti_3−xC₂T_y/g-C₃N₄ heterostructures for boosted photocatalytic H₂ evolution. Nano Res. 2023;16:6652-6660.

[360] Liu C, Xiao W, Yu G, et al. Interfacial engineering of Ti₃C₂ MXene/CdIn₂S₄ Schottky heterojunctions for boosting visible-light H₂ evolution and Cr(VI) reduction. J Colloid Interface Sci. 2023;640:851-863.

[361] Wu C, Huang W, Liu H, Lv K, Li Q. Insight into synergistic effect of Ti₃C₂ MXene and MoS₂ on anti-photocorrosion and photocatalytic of CdS for hydrogen production. Appl Catal B. 2023;330:122653.

[362] Zhang S, Du S, Wang Y, et al. Metal-organic coordination polymers-derived ultra-small MoC nanodot/N-doped carbon combined with CdS: a hollow Z-type catalyst for stable and efficient H₂ production/CO₂ reduction. Appl Surf Sci. 2023;608:155176.

[363] Li J, Peng H, Luo B, Cao J, Ma L, Jing D. The enhanced photocatalytic and photothermal effects of Ti₃C₂ MXene quantum dot/macroscopic porous graphitic carbon nitride heterojunction for hydrogen production. J Colloid Interface Sci. 2023;641:309-318.

[364] Nagoor Meeran M, Haridharan N, Shkir M, Algarni H, Reddy Minnam Reddy V. Rationally designed 1D CdS/TiO₂@Ti₃C₂ multi-components nanocomposites for enhanced visible light photocatalytic hydrogen production. Chem Phys Lett. 2022;809:140150.

[365] Xu C, Li D, Liu H, et al. Construction of 1D/0D CdS nanorods/Ti₃C₂ QDs Schottky heterojunctions for efficient photocatalysis. J Environ Chem Eng. 2023;11(1):109191.

[366] Almusattar W, Tahir M, Madi M, Tahir B. Fabricating Ti₃C₂ MXene cocatalyst supported NiAl-LDH/g-C₃N₄ ternary nanocomposite for stimulating solar photocatalytic H₂ production. J Environ Chem Eng. 2022;10(4):108010.

[367] Wang B, Sun Y, Fan X, et al. In situ growth of 1T-WS₂ on ultrathin Ti₃C₂T_x as a hybrid cocatalyst for enhancing the photocatalytic activity of CdS. Appl Surf Sci. 2023;615:156305.

[368] Lei Y, Ng KH, Zhu Y, et al. Mo-activated VC as effective cocatalyst for an enhanced photocatalytic hydrogen evolution activity of CdS. Chem Eng J. 2023;452(Pt 3):139325.

[369] Zhang X, Tian F, Gao M, Yang W, Yu Y. L-cysteine capped Mo₂C/Zn_0.67Cd_0.33S heterojunction with intimate covalent bonds enables efficient and stable H₂-releasing photocatalysis. Chem Eng J. 2022;428:132628.

[370] Gu H, Zhang H, Wang X, et al. Robust construction of CdSe nanorods@Ti₃C₂ MXene nanosheet for superior photocatalytic H₂ evolution. Appl Catal B. 2023;328:122537.

[371] Zhou H, Tian J, Wang R, et al. Lewis acid molten salts prepared Ti₃C₂Cl₂ MXenes assembling with g-C₃N₄ nanosheets for enhanced photocatalytic H₂ evolution. Ceram Int. 2023;49(8):13042-13049.

[372] Yuan X, Zhang Y, Zhang Y, et al. Cyano-bridged Schottky junction of CN-TiC for enhanced photocatalytic H₂ evolution and tetracycline degradation. Appl Surf Sci. 2022;583:152515.

[373] Qiao X-Q, Wang Z, Li C, et al. A new, efficient and durable MoO₂/Mo₂C-C cocatalyst with the optimized composition and electronic structure via in-situ carburization for photocatalytic H₂ evolution. Chem Eng J. 2023;455:140791.

[374] Liu Y, Wang Z, Yao L, Shi L. Ti₃C₂/Mn_0.5Cd_0.5S composite photocatalyst for enhanced H₂ generation. Mater Chem Phys. 2023;297:127410.

[375] Chen L, Qiang T, Qiu B, Yu M, Ren L. Monolayered Ti₃C₂O/(001) TiO₂ photocatalyst with Schottky junction and active facets for hydrogen production. Int J Hydrogen Energy. 2022;47(69):29741-29752.

[376] Wang Z, Zhang Y, Chen Y, et al. Surface -O terminated urchin-like TiO₂/Ti₃C₂O_x (MXene) as high performance photocatalyst: Interfacial engineering and mechanism insight. Appl Surf Sci. 2023;615:156343.

[377] Zhao C, Yang X, Han C, Xu J. Sacrificial agent-free photocatalytic oxygen evolution from water splitting over Ag₃PO₄/MXene hybrids. Solar RRL. 2020;4(8):1900434.

[378] Li Y, Deng X, Tian J, Liang Z, Cui H. Ti₃C₂ MXene-derived Ti₃C₂/TiO₂ nanoflowers for noble-metal-free photocatalytic overall water splitting. Appl Mater Today. 2018;13:217-227.

[379] Li Y, Liu Y, Xing D, et al. 2D/2D heterostructure of ultrathin BiVO₄/Ti₃C₂ nanosheets for photocatalytic overall water splitting. Appl Catal B. 2021;285:119855.

[380] Ai Z, Zhang K, Xu L, et al. In situ configuration of dual S-scheme BP/(Ti₃C₂T_x@TiO₂) heterojunction for broadband spectrum solar-driven photocatalytic H₂ evolution in pure water. J Colloid Interface Sci. 2022;610:13-23.

[381] Liu X, Zhang J, Xu J, et al. Hydroxyl-modified Nb₄C₃T_x MXene@ZnIn₂S₄ sandwich structure for photocatalytic overall water splitting. J Colloid Interface Sci. 2023;633:992-1001.

[382] Fu C-F, Li X, Luo Q, Yang J. Two-dimensional multilayer M₂CO₂ (M = Sc, Zr, Hf) as photocatalysts for hydrogen production from water splitting: a first principles study. J Mater Chem A. 2017;5(47):24972-24980.

[383] Takanabe K. Photocatalytic water splitting: quantitative approaches toward photocatalyst by design. ACS Catal. 2017;7(11):8006-8022.

[384] Fajrina N, Tahir M. A critical review in strategies to improve photocatalytic water splitting towards hydrogen production. Int J Hydrogen Energy. 2019;44(2):540-577.

[385] Zhang X, Zhao X, Wu D, Jing Y, Zhou Z. High and anisotropic carrier mobility in experimentally possible Ti₂CO₂ (MXene) monolayers and nanoribbons. Nanoscale. 2015;7(38):16020-16025.

[386] Putri LK, Ong W-J, Chang WS, Chai S-P. Enhancement in the photocatalytic activity of carbon nitride through hybridization with light-sensitive AgCl for carbon dioxide reduction to methane. Catal Sci Technol. 2016;6(3):744-754.

[387] Ong W-J, Putri LK, Mohamed AR. Rational design of carbon-based 2D nanostructures for enhanced photocatalytic CO₂ reduction: a dimensionality perspective. Chem A Eur J. 2020;26(44):9710-9748.

[388] Cao S, Shen B, Tong T, Fu J, Yu J. 2D/2D heterojunction of ultrathin MXene/Bi₂WO₆ nanosheets for improved photocatalytic CO₂ reduction. Adv Funct Mater. 2018;28(21):1800136.

[389] Ong W-J, Shak KPY. 2D/2D heterostructured photocatalysts: an emerging platform for artificial photosynthesis. Solar RRL. 2020;4(8):2000132.

[390] Yang C, Tan Q, Li Q, et al. 2D/2D Ti₃C₂ MXene/g-C₃N₄ nanosheets heterojunction for high efficient CO₂ reduction photocatalyst: dual effects of urea. Appl Catal B. 2020;268:118738.

[391] Zhang Y, Chen W, Zhou M, Miao G, Liu Y. Efficient photocatalytic CO₂ reduction by the construction of Ti₃C₂/CsPbBr₃ QD composites. ACS Appl Energy Mater. 2021;4(9):9154-9165.

[392] Wang H. Nanostructure@metal-organic frameworks (MOFs) for catalytic carbon dioxide (CO₂) conversion in photocatalysis, electrocatalysis, and thermal catalysis. Nano Res. 2022;15(4):2834-2854.

[393] Wu Y, Li X, Yang Q, et al. MXene-modulated dual-heterojunction generation on a metal-organic framework (MOF) via surface constitution reconstruction for enhanced photocatalytic activity. Chem Eng J. 2020;390:124519.

[394] Zeng Z, Yan Y, Chen J, Zan P, Tian Q, Chen P. Boosting the photocatalytic ability of Cu₂O nanowires for CO₂ conversion by MXene quantum dots. Adv Funct Mater. 2019;29(2):1806500.

[395] Ding Y, Nie X, Dong H, Rujisamphan N, Li Y. Size-dependent electronic, optical and photocatalytic properties of Ti₃C₂O₂ quantum dots studied by first-principles calculations. Phys E. 2020;124:114328.

[396] Vu N-N, Kaliaguine S, Do T-O. Critical aspects and recent advances in structural engineering of photocatalysts for sunlight-driven photocatalytic reduction of CO₂ into fuels. Adv Funct Mater. 2019;29(31):1901825.

[397] Albero J, Peng Y, García H. Photocatalytic CO₂ reduction to C2+ products. ACS Catal. 2020;10(10):5734-5749.

[398] Que M, Cai W, Zhao Y, et al. 2D/2D Schottky heterojunction of in-situ growth FAPbBr₃/Ti₃C₂ composites for enhancing photocatalytic CO₂ reduction. J Colloid Interface Sci. 2022;610:538-545.

[399] Tahir M, Tahir B. 2D/2D/2D O-C₃N₄/Bt/Ti₃C₂T_x heterojunction with novel MXene/clay multi-electron mediator for stimulating photo-induced CO₂ reforming to CO and CH₄. Chem Eng J. 2020;400:125868.

[400] Hong L, Guo R, Yuan Y, et al. 2D Ti₃C₂ decorated Z-scheme BiOIO₃/g-C₃N₄ heterojunction for the enhanced photocatalytic CO₂ reduction activity under visible light. Colloids Surf A. 2022;639:128358.

[401] Li L, Yang Y, Yang L, Wang X, Zhou Y, Zou Z. 3D hydrangea-like InVO₄/Ti₃C₂T_x hierarchical heterosystem collaborating with 2D/2D interface interaction for enhanced photocatalytic CO₂ reduction. ChemNanoMat. 2021;7(7):815-823.

[402] Que M, Zhao Y, Yang Y, et al. Anchoring of formamidinium lead bromide quantum dots on Ti₃C₂ nanosheets for efficient photocatalytic reduction of CO₂. ACS Appl Mater Interfaces. 2021;13(5):6180-6187.

[403] Pan A, Ma X, Huang S, et al. CsPbBr₃ perovskite nanocrystal grown on MXene nanosheets for enhanced photoelectric detection and photocatalytic CO₂ reduction. J Phys Chem Lett. 2019;10(21):6590-6597.

[404] Zhang J, Shi J, Tao S, Wu L, Lu J. Cu₂O/Ti₃C₂MXene heterojunction photocatalysts for improved CO₂ photocatalytic reduction performance. Appl Surf Sci. 2021;542:148685.

[405] Tang Q, Sun Z, Deng S, Wang H, Wu Z. Decorating g-C₃N₄ with alkalinized Ti₃C₂ MXene for promoted photocatalytic CO₂ reduction performance. J Colloid Interface Sci. 2020;564:406-417.

[406] Albo J, García G. Enhanced visible-light photoreduction of CO₂ to methanol over Mo₂C/TiO₂ surfaces in an optofluidic microreactor. React Chem Eng. 2021;6(2):304-312.

[407] Saeed A, Chen W, Shah AH, Zhang Y, Mehmood I, Liu Y. Enhancement of photocatalytic CO₂ reduction for novel Cd_0.2Zn_0.8S@Ti₃C₂ (MXenes) nanocomposites. J CO2 Util. 2021;47:101501.

[408] Zhang S, Xiong W, Long J, et al. High-throughput lateral and basal interface in CeO₂@Ti₃C₂T_x: reverse and synergistic migration of carrier for enhanced photocatalytic CO₂ reduction. J Colloid Interface Sci. 2022;615:716-724.

[409] Tahir M, Tahir B. In-situ growth of TiO₂ imbedded Ti₃C₂T_A nanosheets to construct PCN/Ti₃C₂T_A MXenes 2D/3D heterojunction for efficient solar-driven photocatalytic CO₂ reduction towards CO and CH₄ production. J Colloid Interface Sci. 2021;591:20-37.

[410] Li X, Bai Y, Shi X, et al. Mesoporous g-C₃N₄/MXene (Ti₃C₂T_x) heterojunction as a 2D electronic charge transfer for efficient photocatalytic CO₂ reduction. Appl Surf Sci. 2021;546:149111.

[411] Men Y-L, You Y, Pan Y-X, et al. Selective CO evolution from photoreduction of CO₂ on a metal-carbide-based composite catalyst. J Am Chem Soc. 2018;140(40):13071-13077.

[412] Hu J, Ding J, Zhong Q. Ultrathin 2D Ti₃C₂ MXene co-catalyst anchored on porous g-C₃N₄ for enhanced photocatalytic CO₂ reduction under visible-light irradiation. J Colloid Interface Sci. 2021;582:647-657.

[413] Chen W, Han B, Xie Y, Liang S, Deng H, Lin Z. Ultrathin Co-Co LDHs nanosheets assembled vertically on MXene: 3D nanoarrays for boosted visible-light-driven CO₂ reduction. Chem Eng J. 2020;391:123519.

[414] Zhao S, Pan D, Liang Q, et al. Ultrathin NiAl-layered double hydroxides grown on 2D Ti₃C₂T_x MXene to construct core–shell heterostructures for enhanced photocatalytic CO₂ reduction. J Phys Chem C. 2021;125(19):10207-10218.

[415] Wang K, Li X, Wang N, et al. Z-scheme core–shell meso-TiO₂@ZnIn₂S₄/Ti₃C₂ MXene enhances visible light-driven CO₂-to-CH₄ selectivity. Ind Eng Chem Res. 2021;60(24):8720-8732.

[416] Wang K, Wang Q, Zhang K, Wang G, Wang H. Selective solar-driven CO₂ reduction mediated by 2D/2D Bi₂O₂SiO₃/MXene nanosheets heterojunction. J Mater Sci Technol. 2022;124:202-208.

[417] Zhang Z, Wang B, Zhao H-B, et al. Self-assembled lead-free double perovskite-MXene heterostructure with efficient charge separation for photocatalytic CO₂ reduction. Appl Catal B. 2022;312:121358.

[418] Du Z, Cai H, Guo Z, et al. Synergistic photocatalytic of CO₂-to-CO conversion by 2D/1D Ti₃C₂T_x/p-BN heterojunction with interfacial chemical bonding. J Alloys Compd. 2022;920:165933.

[419] Xiao Y, Men C, Chu B, et al. Spontaneous reduction of copper on Ti₃C₂T_x as fast electron transport channels and active sites for enhanced photocatalytic CO₂ reduction. Chem Eng J. 2022;446(Pt 1):137028.

[420] Peng H, Deng X, Li G, et al. Oxygen vacancy and Van der Waals heterojunction modulated interfacial chemical bond over Mo₂C/Bi₄O₅Br₂ for boosting photocatalytic CO₂ reduction. Appl Catal B. 2022;318:121866.

[421] Li J, Wang Y, Wang Y, et al. MXene Ti₃C₂ decorated g-C₃N₄/ZnO photocatalysts with improved photocatalytic performance for CO₂ reduction. Nano Mater Sci. 2023;5(2):237-245.

[422] Madi M, Tahir M, Zakaria ZY. 2D/2D V₂C mediated porous g-C₃N₄ heterojunction with the role of monolayer/multilayer MAX/MXene structures for stimulating photocatalytic CO₂ reduction to fuels. J CO2 Util. 2022;65:102238.

[423] Wang Z, Guo Y, Zhang Q, Li Z, Zhao Y, Wang H. Alkanolamine intercalation assisted liquid phase exfoliation of titanium carbide MXene nanosheets for highly efficient photocatalytic CO₂ reduction. J Mol Liq. 2022;367:120578.

[424] Kim J, Yoon Y, Kim SK, et al. Chemically stabilized and functionalized 2D-MXene with deep eutectic solvents as versatile dispersion medium. Adv Funct Mater. 2021;31(13):2008722.

[425] Song H, Wang Y, Ling Z, et al. Enhanced photocatalytic degradation of perfluorooctanoic acid by Ti₃C₂ MXene-derived heterojunction photocatalyst: application of intercalation strategy in DESs. Sci Total Environ. 2020;746:141009.

[426] Palisaitis J, Persson I, Halim J, Rosen J, Persson POÅ. On the structural stability of MXene and the role of transition metal adatoms. Nanoscale. 2018;10(23):10850-10855.

[427] Habib T, Zhao X, Shah SA, et al. Oxidation stability of Ti₃C₂T_x MXene nanosheets in solvents and composite films. npj 2D Mater Appl. 2019;3(1):8.

[428] Thakur R, VahidMohammadi A, Moncada J, et al. Insights into the thermal and chemical stability of multilayered V₂CT_x MXene. Nanoscale. 2019;11(22):10716-10726.

[429] Chae Y, Kim SJ, Cho S-Y, et al. An investigation into the factors governing the oxidation of two-dimensional Ti₃C₂ MXene. Nanoscale. 2019;11(17):8387-8393.

[430] Lipatov A, Alhabeb M, Lukatskaya MR, Boson A, Gogotsi Y, Sinitskii A. Effect of synthesis on quality, electronic properties and environmental stability of individual monolayer Ti₃C₂ MXene flakes. Adv Electron Mater. 2016;2(12):1600255.

[431] Mashtalir O, Cook KM, Mochalin VN, Crowe M, Barsoum MW, Gogotsi Y. Dye adsorption and decomposition on two-dimensional titanium carbide in aqueous media. J Mater Chem A. 2014;2(35):14334-14338.

[432] Zhao X, Vashisth A, Prehn E, et al. Antioxidants unlock shelf-stable Ti₃C₂T_x (MXene) nanosheet dispersions. Matter. 2019;1(2):513-526.

[433] Wu C-W, Unnikrishnan B, Chen IWP, Harroun SG, Chang H-T, Huang C-C. Excellent oxidation resistive MXene aqueous ink for micro-supercapacitor application. Energy Storage Mater. 2020;25:563-571.

[434] Wu X, Wang Z, Yu M, Xiu L, Qiu J. Stabilizing the MXenes by carbon nanoplating for developing hierarchical nanohybrids with efficient lithium storage and hydrogen evolution capability. Adv Mater. 2017;29(24):1607017.

[435] Natu V, Hart JL, Sokol M, Chiang H, Taheri ML, Barsoum MW. Edge capping of 2D-MXene sheets with polyanionic salts to mitigate oxidation in aqueous colloidal suspensions. Angew Chem Int Ed. 2019;58(36):12655-12660.

[436] Mathis TS, Maleski K, Goad A, et al. Modified MAX phase synthesis for environmentally stable and highly conductive Ti₃C₂ MXene. ACS Nano. 2021;15(4):6420-6429.

[437] Zhan C, Sun W, Xie Y, Jiang D, Kent PRC. Computational discovery and design of MXenes for energy applications: status, successes, and opportunities. ACS Appl Mater Interfaces. 2019;11(28):24885-24905.

[438] Khazaei M, Mishra A, Venkataramanan NS, Singh AK, Yunoki S. Recent advances in MXenes: from fundamentals to applications. Curr Opin Solid State Mater Sci. 2019;23(3):164-178.

[439] Rajan AC, Mishra A, Satsangi S, et al. Machine-learning-assisted accurate band gap predictions of functionalized MXene. Chem Mater. 2018;30(12):4031-4038.

[440] Mishra A, Satsangi S, Rajan AC, Mizuseki H, Lee K-R, Singh AK. Accelerated data-driven accurate positioning of the band edges of MXenes. J Phys Chem Lett. 2019;10(4):780-785.

[441] Frey NC, Akinwande D, Jariwala D, Shenoy VB. Machine learning-enabled design of point defects in 2D materials for quantum and neuromorphic information processing. ACS Nano. 2020;14(10):13406-13417.

[442] Khaledialidusti R, Khazaei M, Khazaei S, Ohno K. High-throughput computational discovery of ternary-layered MAX phases and prediction of their exfoliation for formation of 2D MXenes. Nanoscale. 2021;13(15):7294-7307.

[443] Frey NC, Wang J, Vega Bellido GI, Anasori B, Gogotsi Y, Shenoy VB. Prediction of synthesis of 2D metal carbides and nitrides (MXenes) and their precursors with positive and unlabeled machine learning. ACS Nano. 2019;13(3):3031-3041.

[444] He M, Zhang L. Machine learning and symbolic regression investigation on stability of MXene materials. Comput Mater Sci. 2021;196:110578.

[445] Loh JYY, Sharma G, Kherani NP, Ozin GA. Post-illumination photoconductivity enables extension of photo-catalysis after sunset. Adv Energy Mater. 2021;11(41):2101566.

[446] Ling GZS, Foo JJ, Tan X-Q, Ong W-J. Transition into net-zero carbon community from fossil fuels: life cycle assessment of light-driven CO₂ conversion to methanol using graphitic carbon nitride. ACS Sustain Chem Eng. 2023;11(14):5547-5558.

[447] Ai L, Ng S-F, Ong W-J. A prospective life cycle assessment of electrochemical CO₂ reduction to selective formic acid and ethylene. ChemSusChem. 2022;15(19):e202200857.

[448] Mo W, Tan X-Q, Ong W-J. Prospective life cycle assessment bridging biochemical, thermochemical, and electrochemical CO₂ reduction toward sustainable ethanol synthesis. ACS Sustain Chem Eng. 2023;11(14):5782-5799.

[449] Oh VB-Y, Ng S-F, Ong W-J. Is photocatalytic hydrogen production sustainable?—assessing the potential environmental enhancement of photocatalytic technology against steam methane reforming and electrocatalysis. J Clean Prod. 2022;379(2):134673.

[450] Lin X, Foo JJ, Ong W-J. Unveiling environmental impacts of methanol production via electrocatalysis against conventional and thermochemical routes by life cycle assessment. Sustain Mater Technol. 2023;37:e00663.

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