Vertically aligned montmorillonite aerogel–encapsulated polyethylene glycol with directional heat transfer paths for efficient solar thermal energy harvesting and storage

Abstract

The conversion and storage of photothermal energy using phase change materials (PCMs) represent an optimal approach for harnessing clean and sustainable solar energy. Herein, we encapsulated polyethylene glycol (PEG) in montmorillonite aerogels (3D-Mt) through vacuum impregnation to prepare 3D-Mt/PEG composite PCMs. When used as a support matrix, 3D-Mt can effectively prevent PEG leakage and act as a flame-retardant barrier to reduce the flammability of PEG. Simultaneously, 3D-Mt/PEG demonstrates outstanding shape retention, increased thermal energy storage density, and commendable thermal and chemical stability. The phase transition enthalpy of 3D-Mt/PEG can reach 167.53 J/g and remains stable even after 50 heating–cooling cycles. Furthermore, the vertical sheet-like structure of 3D-Mt establishes directional heat transport channels, facilitating efficient phonon transfer. This configuration results in highly anisotropic thermal conductivities that ensure swift thermal responses and efficient heat conduction. This study addresses the shortcomings of PCMs, including the issues of leakage and inadequate flame retardancy. It achieves the development and design of 3D-Mt/PEG with ultrahigh strength, superior flame retardancy, and directional heat transfer. Therefore, this work offers a design strategy for the preparation of high-performance composite PCMs. The 3D-Mt/PEG with vertically aligned and well-ordered array structure developed in this research shows great potential for thermal management and photothermal conversion applications.

Keywords

montmorillonite aerogel / polyethylene glycol / phase change materials / solar thermal energy storage / flame retardant

References

[1] Pielichowska K, Pielichowski K. Phase change materials for thermal energy storage. Prog. Mater. Sci., 2014, 65, 67.

[2] Tang LS, Yang J, Bao RY, et al. Polyethylene glycol/graphene oxide aerogel shape-stabilized phase change materials for photo-to-thermal energy conversion and storage via tuning the oxidation degree of graphene oxide. Energy Convers. Manage., 2017, 146, 253.

[3] Z.D. Tang, H.Y. Gao, X. Chen, Y.F. Zhang, A. Li, and G. Wang, Advanced multifunctional composite phase change materials based on photo-responsive materials, Nano Energy, 80(2021), art. No. 105454.

[4] H.Y. Wu, S.T. Li, Y.W. Shao, et al., Melamine foam/reduced graphene oxide supported form-stable phase change materials with simultaneous shape memory property and light-to-thermal energy storage capability, Chem. Eng. J., 379(2020), art. No. 122373.

[5] Q.J. Guo, H. Yi, F.F. Jia, and S.X. Song, Design of MoS₂/MMT bi-layered aerogels integrated with phase change materials for sustained and efficient solar desalination, Desalination, 541(2022), art. No. 116028.

[6] B.Y. Gong, H.C. Yang, S.H. Wu, et al., Phase change material enhanced sustained and energy-efficient solar-thermal water desalination, Appl. Energy, 301(2021), art. No. 117463.

[7] S. Aghakhani, A. Ghaffarkhah, M. Arjmand, N. Karimi, and M. Afrand, Phase change materials: Agents towards energy performance improvement in inclined, vertical, and horizontal walls of residential buildings, J. Build. Eng., 56(2022), art. No. 104656.

[8] S.R.L. da Cunha and J.L.B. de Aguiar, Phase change materials and energy efficiency of buildings: A review of knowledge, J. Energy Storage, 27(2020), art. No. 101083.

[9] Q.R. Zhang, T.T. Xue, J. Tian, Y. Yang, W. Fan, and T.X. Liu, Polyimide/boron nitride composite aerogel fiber-based phase-changeable textile for intelligent personal thermoregulation, Compos. Sci. Technol., 226(2022), art. No. 109541.

[10] K.Y. Sun, H.S. Dong, Y. Kou, et al., Flexible graphene aerogel-based phase change film for solar-thermal energy conversion and storage in personal thermal management applications, Chem. Eng. J., 419(2021), art. No. 129637.

[11] Lu Y, Xiao XD, Fu J, et al. Novel smart textile with phase change materials encapsulated core-sheath structure fabricated by coaxial electrospinning. Chem. Eng. J., 2019, 355, 532.

[12] Wang XC, Li GY, Hong G, Guo Q, Zhang XT. Graphene aerogel templated fabrication of phase change microspheres as thermal buffers in microelectronic devices. ACS Appl. Mater. Interfaces, 2017, 9(47): 41323.

[13] J. Luo, D.Q. Zou, Y.S. Wang, S. Wang, and L. Huang, Battery thermal management systems (BTMs) based on phase change material (PCM): A comprehensive review, Chem. Eng. J., 430(2022), art. No. 132741.

[14] Shon J, Kim H, Lee K. Improved heat storage rate for an automobile coolant waste heat recovery system using phase-change material in a fin–tube heat exchanger. Appl. Energy, 2014, 113, 680.

[15] Gong S, Li XL, Sheng MJ, et al. High thermal conductivity and mechanical strength phase change composite with double supporting skeletons for industrial waste heat recovery. ACS Appl. Mater. Interfaces, 2021, 13(39): 47174.

[16] Nazir H, Batool M, Osorio FJB, et al. Recent developments in phase change materials for energy storage applications: A review. Int. J. Heat Mass Transf., 2019, 129, 491.

[17] Gao DC, Sun YJ, Fong AM, Gu XB. Mineral-based form-stable phase change materials for thermal energy storage: A state-of-the art review. Energy Storage Mater., 2022, 46, 100.

[18] Zhang DY, Li CC, Lin NZ, Xie BS, Chen J. Mica-stabilized polyethylene glycol composite phase change materials for thermal energy storage. Int. J. Miner. Metall. Mater., 2022, 29(1): 168.

[19] Li CC, Peng XK, He JJ, Chen J. Modified sepiolite stabilized stearic acid as a form-stable phase change material for thermal energy storage. Int. J. Miner. Metall. Mater., 2023, 30(9): 1835.

[20] Qian TT, Li JH, Min X, Deng Y, Guan WM, Ning L. Diatomite: A promising natural candidate as carrier material for low, middle and high temperature phase change material. Energy Convers. Manage., 2015, 98, 34.

[21] Li M, Wu ZS. A review of intercalation composite phase change material: Preparation, structure and properties. Renewable Sustainable Energy Rev., 2012, 16(4): 2094.

[22] Lv PZ, Liu CZ, Rao ZH. Review on clay mineral-based form-stable phase change materials: Preparation, characterization and applications. Renewable Sustainable Energy Rev., 2017, 68, 707.

[23] Li M, Wu ZS, Kao HT, Tan JM. Experimental investigation of preparation and thermal performances of paraffin/bentonite composite phase change material. Energy Convers. Manage., 2011, 52(11): 3275.

[24] Giro-Paloma J, Martínez M, Cabeza LF, Inés A. Fernández, Types, methods, techniques, and applications for microencapsulated phase change materials (MPCM): A review. Renewable Sustainable Energy Rev., 2016, 53, 1059.

[25] Alva G, Lin YX, Liu LK, Fang GY. Synthesis, characterization and applications of microencapsulated phase change materials in thermal energy storage: A review. Energy Build., 2017, 144, 276.

[26] Yi H, Zhan WQ, Zhao YL, et al. A novel core-shell structural montmorillonite nanosheets/stearic acid composite PCM for great promotion of thermal energy storage properties. Sol. Energy Mater. Sol. Cells, 2019, 192, 57.

[27] Z. Sun, L.J. Zhao, H.X. Wan, H. Liu, D.Z. Wu, and X.D. Wang, Construction of polyaniline/carbon nanotubes-functionalized phase-change microcapsules for thermal management application of supercapacitors, Chem. Eng. J., 396(2020), art. No. 125317.

[28] Z. Zhang, Z. Zhang, T. Chang, J. Wang, X. Wang, and G.F. Zhou, Phase change material microcapsules with melamine resin shell via cellulose nanocrystal stabilized Pickering emulsion in situ polymerization, Chem. Eng. J., 428(2022), art. No. 131164.

[29] Liu P, Chen X, Li Y, et al. Aerogels meet phase change materials: Fundamentals, advances, and beyond. ACS Nano, 2022, 16(10): 15586.

[30] Kashyap S, Kabra S, Kandasubramanian B. Graphene aerogel-based phase changing composites for thermal energy storage systems. J. Mater. Sci., 2020, 55(10): 4127.

[31] H. Yi, Z. Ai, Y.L. Zhao, X. Zhang, and S.X. Song, Design of 3D-network montmorillonite nanosheet/stearic acid shape-stabilized phase change materials for solar energy storage, Sol. Energy Mater. Sol. Cells, 204(2020), art. No. 110233.

[32] Hong HZ, Pan Y, Sun HX, et al. Superwetting polypropylene aerogel supported form-stable phase change materials with extremely high organics loading and enhanced thermal conductivity. Sol. Energy Mater. Sol. Cells, 2018, 174, 307.

[33] M. Cheng, J. Hu, J.Q. Xia, et al., One-step in situ green synthesis of cellulose nanocrystal aerogel based shape stable phase change material, Chem. Eng. J., 431(2022), art. No. 133935.

[34] Q.J. Guo, Q. An, H. Yi, F.F. Jia, and S.X. Song, Double-layered montmorillonite/MoS₂ aerogel with vertical channel for efficient and stable solar interfacial desalination, Appl. Clay Sci., 217(2022), art. No. 106389.

[35] Liu DY, Lei CX, Wu K, Fu Q. A multidirectionally thermoconductive phase change material enables high and durable electricity via real-environment solar-thermal-electric conversion. ACS Nano, 2020, 14(11): 15738.

[36] Iliescu RI, Andronescu E, Ghitulica CD, Voicu G, Ficai A, Hoteteu M. Montmorillonite-alginate nanocomposite as a drug delivery system: Incorporation and in vitro release of irinotecan. Int. J. Pharm., 2014, 463(2): 184.

[37] Olad A, Pourkhiyabi M, Gharekhani H, Doustdar F. Semi-IPN superabsorbent nanocomposite based on sodium alginate and montmorillonite: Reaction parameters and swelling characteristics. Carbohydr. Polym., 2018, 190, 295.

[38] H. Yi, L. Xia, and S.X. Song, Three-dimensional montmorillonite/Ag nanowire aerogel supported stearic acid as composite phase change materials for superior solar-thermal energy harvesting and storage, Compos. Sci. Technol., 217(2022), art. No. 109121.

[39] Guo QJ, Yi H, Jia FF, Song SX. Vertical porous MoS₂/hectorite double-layered aerogel as superior salt resistant and highly efficient solar steam generators. Renewable Energy, 2022, 194, 68.

[40] Kenawy ER, Azaam MM, El-nshar EM. Sodium alginate-g-poly(acrylic acid-co-2-hydroxyethyl methacrylate)/montmorillonite superabsorbent composite: Preparation, swelling investigation and its application as a slow-release fertilizer. Arab. J. Chem., 2019, 12(6): 847.

[41] E. Tao, D. Ma, S.Y. Yang, and X. Hao, Graphene oxide-montmorillonite/sodium alginate aerogel beads for selective adsorption of methylene blue in wastewater, J. Alloys Compd., 832(2020), art. No. 154833.

[42] Wang W, Zhang CY, He JY, et al. Chitosan-induced self-assembly of montmorillonite nanosheets along the end-face for methylene blue removal from water. Int. J. Biol. Macromol., 2023, 227, 952.

[43] W. Wang, T. Wen, and H.Y. Bai, Adsorption toward Cu(II) and inhibitory effect on bacterial growth occurring on molybdenum disulfide-montmorillonite hydrogel surface, Chemosphere, 248(2020), art. No. 126025.

[44] Zhou Y, Liu XD, Sheng DK, et al. Polyurethane-based solid-solid phase change materials with in situ reduced graphene oxide for light-thermal energy conversion and storage. Chem. Eng. J., 2018, 338, 117.

[45] Zhou Y, Sheng DK, Liu XD, et al. Synthesis and properties of crosslinking halloysite nanotubes/polyurethane-based solid–solid phase change materials. Sol. Energy Mater. Sol. Cells, 2018, 174, 84.

[46] H.H. Liao, W.H. Chen, Y. Liu, and Q. Wang, A phase change material encapsulated in a mechanically strong graphene aerogel with high thermal conductivity and excellent shape stability, Compos. Sci. Technol., 189(2020), art. No. 108010.

[47] Qian TT, Li JH, Min X, Guan WM, Deng Y, Ning L. Enhanced thermal conductivity of PEG/diatomite shape-stabilized phase change materials with Ag nanoparticles for thermal energy storage. J. Mater. Chem. A, 2015, 3(16): 8526.

[48] Chen X, Gao HY, Yang M, et al. Highly graphitized 3D network carbon for shape-stabilized composite PCMs with superior thermal energy harvesting. Nano Energy, 2018, 49, 86.

[49] Yu SY, Wang XD, Wu DZ. Microencapsulation of n-octadecane phase change material with calcium carbonate shell for enhancement of thermal conductivity and serving durability: Synthesis, microstructure, and performance evaluation. Appl. Energy, 2014, 114, 632.

[50] Liu SY, Yang HM. Stearic acid hybridizing coal–series Kaolin composite phase change material for thermal energy storage. Appl. Clay Sci., 2014, 101, 277.

[51] J.M. Gao, S.J. Ma, B. Wang, Z.B. Ma, Y.X. Guo, and F.Q. Cheng, Template-free facile preparation of mesoporous silica from fly ash for shaped composite phase change materials, J. Cleaner Prod., 384 (2023), art. No. 135583.

[52] Y. Wang, Y.H. Song, S. Li, T. Zhang, D.Y. Zhang, and P.R. Guo, Thermophysical properties of three-dimensional palygorskite based composite phase change materials, Appl. Clay Sci., 184(2020), art. No. 105367.

[53] Wei HT, Xie XZ, Li XQ, Lin XS. Preparation and characterization of capric–myristic–stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material. Appl. Energy, 2016, 178, 616.

[54] Zhao YF, Kong WX, Jin ZL, et al. Storing solar energy within Ag–paraffin@Halloysite microspheres as a novel self-heating catalyst. Appl. Energy, 2018, 222, 180.

[55] C.J. Han, H.Z. Gu, M.J. Zhang, A. Huang, Y. Zhang, and Y. Wang, Al–Si@Al₂O₃@mullite microcapsules for thermal energy storage: Preparation and thermal properties, Sol. Energy Mater. Sol. Cells, 217(2020), art. No. 110697.

[56] H. Yi, W.Q. Zhan, Y.L. Zhao, et al., Design of MtNS/SA microencapsulated phase change materials for enhancement of thermal energy storage performances: Effect of shell thickness, Sol. Energy Mater. Sol. Cells, 200(2019), art. No. 109935.

[57] A.M. Turan and Y. Konuklu, Developing of capric acid@cole-manite doped melamine formaldehyde microcapsules and composites as novel thermal energy storage materials, Therm. Sci. Eng. Prog., 41(2023), art. No. 101806.

[58] L.Q. Wang, W.D. Liang, Y. Liu, et al., Carbonized clay pectin-based aerogel for light-to-heat conversion and energy storage, Appl. Clay Sci., 224 (2022), art. No. 106524.

[59] J.H. Zhu, Q. An, Q.J. Guo, H. Yi, L. Xia, and S.X. Song, Mechanically strong hectorite aerogel encapsulated octadecane as shape-stabilized phase change materials for thermal energy storage and management, Appl. Clay Sci., 223(2022), art. No. 106511.

[60] Li JR, He LH, Liu TZ, Cao XJ, Zhu HZ. Preparation and characterization of PEG/SiO₂ composites as shape-stabilized phase change materials for thermal energy storage. Sol. Energy Mater. Sol. Cells, 2013, 118, 48.

[61] Li BM, Shu D, Wang RF, et al. Polyethylene glycol/silica (PEG@SiO₂) composite inspired by the synthesis of mesoporous materials as shape-stabilized phase change material for energy storage. Renewable Energy, 2020, 145, 84.

[62] R.M. Nair, B. Bindhu, and V.L. Reena, A polymer blend from Gum Arabic and sodium alginate-preparation and characterization, J. Polym. Res., 27(2020), No. 6, art. No. 154.

[63] Swamy TMM, Ramaraj B, Siddaramaiah Sodium alginate and poly(ethylene glycol) blends: Thermal and morphological behaviors. J. Macromol. Sci. Part A, 2010, 47(9): 877.