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

Qijing Guo; Cong Guo; Hao Yi; Feifei Jia; Shaoxian Song

doi:10.1007/s12613-023-2794-3

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Qijing Guo, Cong Guo, Hao Yi, Feifei Jia, and Shaoxian Song, Vertically aligned montmorillonite aerogel–encapsulated polyethylene glycol with directional heat transfer paths for efficient solar thermal energy harvesting and storage, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2794-3

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Qijing Guo, Cong Guo, Hao Yi, Feifei Jia, and Shaoxian Song, Vertically aligned montmorillonite aerogel–encapsulated polyethylene glycol with directional heat transfer paths for efficient solar thermal energy harvesting and storage, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2794-3

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

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Corresponding authors:
Hao Yi E-mail: yihao287@whut.edu.cn

Shaoxian Song E-mail: ssx821215@whut.edu.cn
Received: 23 August 2023; Revised: 15 November 2023; Accepted: 22 November 2023; Available online: 25 November 2023

Abstract

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.
- montmorillonite aerogel;
- polyethylene glycol;
- phase change materials;
- solar thermal energy storage;
- flame retardant

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