One-Step Hydrothermal Synthesis of a CoTe@rGO Electrode Material for Supercapacitors

Abstract

CoTe@reduced graphene oxide (CoTe@rGO) electrode materials for supercapacitors were prepared by a one-step hydrothermal method in this paper. Compared with that of pure CoTe, the electrochemical performance of CoTe@rGO was significantly improved. The results showed that the optimal CoTe@rGO electrode material has a remarkably high specific capacitance of 810.6 F/g at a current density of 1 A/g. At 5 A/g, the synthesized material retained 77.2% of its initial capacitance even after 5000 charge/discharge cycles, thereby demonstrating good cycling stability. Moreover, even at a high current density of 20 A/g, the composite electrode retained 79.0% of its specific capacitance at 1 A/g, thus confirming its excellent rate performance. An asymmetric supercapacitor (ASC) with a wider potential window and higher energy density was assembled by using 3 M KOH as the electrolyte, the CoTe@rGO electrode as the positive electrode, and active carbon as the negative electrode. The operating voltage of the supercapacitor could be increased to 1.6 V, and its specific capacitance could reach 112.6 F/g at 1 A/g. The specific capacitance retention rate of the fabricated supercapacitor after 5000 charge/discharge cycles at 5 A/g was 87.1%, which confirms its excellent cycling stability. In addition, the ASC revealed a high energy density of 40.04 W·h/kg at a power density of 799.91 W/kg and a high power density of 4004.93 W/kg at an energy density of 33.43 W·h/kg. These results collectively show that CoTe@rGO materials have broad application prospects.

Keywords

Asymmetric supercapacitors / Cobalt telluride / Reduced graphene oxide / Electrode materials / High performance

References

[1] Aricò AS, Bruce P, Scrosati B et al (2005) Nanostructured materials for advanced energy conversion and storage devices. Nat Mater 4(5):366–377 https://www.ncbi.nlm.nih.gov/pubmed/15867920/

[2] Hall PJ, Bain EJ Energy-storage technologies and electricity generation. Energy Pol., 2008, 36(12): 4352-4355.

[3] Zhang J, Zhao XS (2012) On the configuration of supercapacitors for maximizing electrochemical performance. ChemSusChem 5(5):818–841 https://www.ncbi.nlm.nih.gov/pubmed/22550045/

[4] Wang GP, Zhang L, Zhang JJ (2012) A review of electrode materials for electrochemical supercapacitors. Chem Soc Rev 41(2):797–828 https://www.ncbi.nlm.nih.gov/pubmed/21779609/

[5] Simon P, Gogotsi Y (2008) Materials for electrochemical capacitors. Nat Mater 7(11):845–854 https://www.ncbi.nlm.nih.gov/pubmed/18956000/

[6] Miller JR, Simon P (2008) Materials science: electrochemical capacitors for energy management. Science 321(5889):651–652 https://www.ncbi.nlm.nih.gov/pubmed/18669852/

[7] Zhang G, David Lou XW (2013) Controlled growth of NiCo₂O₄ nanorods and ultrathin nanosheets on carbon nanofibers for high-performance supercapacitors. Sci Rep 3:1470 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3600593/

[8] Wang Y, Song Y, Xia Y (2016) Electrochemical capacitors: mechanism, materials, systems, characterization and applications. Chem Soc Rev 45(21):5925–5950 https://www.ncbi.nlm.nih.gov/pubmed/27545205/

[9] Tao F, Zhao YQ, Zhang GQ, et al. Electrochemical characterization on cobalt sulfide for electrochemical supercapacitors. Electrochem Commun, 2007, 9(6): 1282-1287.

[10] Yang JQ, Duan XC, Qin Q, et al. Solvothermal synthesis of hierarchical flower-like β-NiS with excellent electrochemical performance for supercapacitors. J Mater Chem A, 2013, 1(27): 7880-7884.

[11] Wang ZH, Sha Q, Zhang FW, et al. Synthesis of poly crystalline cobalt selenide nanotubes and their catalytic and capacitive behaviors. CrystEngComm, 2013, 15(29): 5928.

[12] Guo KL, Cui SZ, Hou HW et al (2016) Hierarchical ternary Ni–Co–Se nanowires for high-performance supercapacitor device design. Dalton Trans 45(48):19458–19465 https://www.ncbi.nlm.nih.gov/pubmed/27885371/

[13] Chen HC, Jiang JJ, Zhao YD, et al. One-pot synthesis of porous nickel cobalt sulphides: tuning the composition for superior pseudocapacitance. J Mater Chem A, 2015, 3(1): 428-437.

[14] Zhao CJ, Shao XX, Zhu ZQ, et al. One-pot hydrothermal synthesis of RGO/FeS composite on Fe foil for high performance supercapacitors. Electrochim Acta, 2017, 246: 497-506.

[15] Ye BR, Huang ML, Jiang S, et al. In-situ growth of Se-doped NiTe on nickel foam as positive electrode material for high-performance asymmetric supercapacitor. Mater Chem Phys, 2018, 211: 389-398.

[16] Xiao M, Su YP, Zhao ML et al (2020) Synthesis of CoTe nanowires: a new electrode material for supercapacitor with high stability and high performance. Nanotechnology 31(5):055706https://www.ncbi.nlm.nih.gov/pubmed/31614344/

[17] Shi WH, Zhu JX, Sim DH, et al. Achieving high specific charge capacitances in Fe₃O₄/reduced graphene oxide nanocomposites. J Mater Chem, 2011, 21(10): 3422.

[18] Ma H, He J, Xiong DB et al (2016) Nickel cobalt hydroxide @Reduced graphene oxide hybrid nanolayers for high performance asymmetric supercapacitors with remarkable cycling stability. ACS Appl Mater Interfaces 8(3):1992–2000 https://www.ncbi.nlm.nih.gov/pubmed/26742692/

[19] Zhao CJ, Shao XX, Zhang YX et al (2016) Fe₂O₃/reduced graphene oxide/Fe₃O₄ composite in situ grown on Fe foil for high-performance supercapacitors. ACS Appl Mater Interfaces 8(44):30133–30142 https://www.ncbi.nlm.nih.gov/pubmed/27759364/

[20] Abdel-Aal SK, Attia SY, Mohamed SG Facile synthesis of Mn₃O₄-rGO nanocomposite as an efficient electrode material for application in supercapacitors. J Electron Mater, 2019, 48(8): 4977-4986.

[21] BoopathiRaja R, Parthibavarman M, Prabhu S, et al. A facile one step hydrothermal induced hexagonal shaped CuS/rGO nanocomposites for asymmetric supercapacitors. Mater Today: Proc, 2020, 26: 3507-3513.

[22] Ghosh S, Samanta P, Samanta P, et al. Investigation of electrochemical charge storage efficiency of NiCo₂Se₄/RGO composites derived at varied duration and its asymmetric supercapacitor device. Energy Fuels, 2020, 34(10): 13056-13066.

[23] Chu XY, Huang TQ, Hu YQ, et al. Wet-spinning assembly of nitrogen-doped graphene film for stable graphene-polyaniline supercapacitor electrodes with high mass loading. Sci China Mater, 2020, 63(10): 1889-1897.

[24] Zhang KY, Wei YH, Huang J, et al. A generalized one-step in situ formation of metal sulfide/reduced graphene oxide nanosheets toward high-performance supercapacitors. Sci China Mater, 2020, 63(10): 1898-1909.

[25] Shao L, Xu JJ, Ma JZ, et al. MXene/RGO composite aerogels with light and high-strength for supercapacitor electrode materials. Compos Commun, 2020, 19: 108-113.

[26] Subhani K, Jin X, Mahon PJ, et al. Graphene aerogel modified carbon fiber reinforced composite structural supercapacitors. Compos Commun, 2021, 24.

[27] AminuddinRosli NH, Lau KS, Winie T, et al. Microwave-assisted reduction of graphene oxide for an electrochemical supercapacitor: structural and capacitance behavior. Mater Chem Phys, 2021, 262.

[28] Zhao ZY, Shen T, Liu ZH, et al. Facile fabrication of binder-free reduced graphene oxide/MnO₂/Ni foam hybrid electrode for high-performance supercapacitors. J Alloy Compd, 2020, 812: 152124.

[29] Xu XW, Pei LY, Yang Y, et al. Facile synthesis of NiWO₄/reduced graphene oxide nanocomposite with excellent capacitive performance for supercapacitors. J Alloy Compd, 2016, 654: 23-31.

[30] Lin JY, Chou SW Cathodic deposition of interlaced nanosheet-like cobalt sulfide films for high-performance supercapacitors. RSC Adv, 2013, 3(6): 2043-2048.

[31] Ye BR, Gong C, Huang ML, et al. Improved performance of a CoTe//AC asymmetric supercapacitor using a redox additive aqueous electrolyte. RSC Adv, 2018, 8(15): 7997-8006.

[32] Ye BR, Huang ML, Fan LQ, et al. Co ions doped NiTe electrode material for asymmetric supercapacitor application. J Alloy Compd, 2019, 776: 993-1001.

[33] Lamiel C, Nguyen VH, Tuma D, et al. Non-aqueous synthesis of ultrasmall NiO nanoparticle-intercalated graphene composite as active electrode material for supercapacitors. Mater Res Bull, 2016, 83: 275-283.

[34] Manikandan M, Subramani K, Sathish M, et al. Hydrothermal synthesis of cobalt telluride nanorods for a high performance hybrid asymmetric supercapacitor. RSC Adv, 2020, 10(23): 13632-13641.

[35] Kshetri T, Singh TI, Lee YS, et al. Metal organic framework-derived cobalt telluride-carbon porous structured composites for high-performance supercapacitor. Compos Part B: Eng, 2021, 211.

[36] Zhu YR, Ji XB, Wu ZP, et al. Spinel NiCo₂O₄ for use as a high-performance supercapacitor electrode material: understanding of its electrochemical properties. J Power Sources, 2014, 267: 888-900.

[37] Tian YF, Ruan YJ, Zhang JY, et al. Controllable growth of NiSe nanorod arrays via one-pot hydrothermal method for high areal-capacitance supercapacitors. Electrochim Acta, 2017, 250: 327-334.

[38] Lai F, Miao YE, Zuo L et al (2016) Biomass-derived nitrogen-doped carbon nanofiber network: a facile template for decoration of ultrathin nickel-cobalt layered double hydroxide nanosheets as high-performance asymmetric supercapacitor electrode. Small 12(24):3235–3244 https://www.ncbi.nlm.nih.gov/pubmed/27135301/

[39] Li ST, Duan YN, Teng Y, et al. MOF-derived tremelliform Co₃O₄/NiO/Mn₂O₃ with excellent capacitive performance. Appl Surf Sci, 2019, 478: 247-254.

[40] Zhang LL, Zhao XS (2009) Carbon-based materials as supercapacitor electrodes. Chem Soc Rev 38(9):2520–2531 https://www.ncbi.nlm.nih.gov/pubmed/19690733/

[41] Gao X, Zhang HW, Guo EJ, et al. Hybrid two-dimensional nickel oxide-reduced graphene oxide nanosheets for supercapacitor electrodes. Microchem J, 2021, 164: 105979.