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Flame-retardant wood-based composite phase change materials based on PDMS/expanded graphite coating for efficient solar-to-thermal energy storage

Author

Listed:
  • Deng, Xunhe
  • Li, Cong
  • Sun, Xiaohan
  • Wang, Chengyu
  • Liu, Baosheng
  • Li, Yudong
  • Yang, Haiyue

Abstract

Wood-based composite phase change materials (PCMs) have considerable development potential in shape-stable thermal energy storage. However, Wood-based composite PCMs possess inflammability due to wood-based supporting materials and organic PCM, which limits its practical application. In this work, a novel strategy of wood-based composite PCMs with flame retardant coating is adopted, in which the introduction of expanded graphite (EG)-based coating can not only enhance the flame retardant property, and EG can be used as photothermal material to improve the photothermal conversion efficiency. The flame-retardant wood-based composite PCMs show excellent flame retardant properties, which peak of heat release rate (pHRR) is reduced by 40.1–52.3% compared with PEG-1000@delignified wood (DW). It is worth noting that when the amount of EG is >0.5 g, the flame-retardant wood-based composite PCMs can be completely protected in the ignition combustion test, and the combustion flame is extinguished by itself. The loading mass fraction of the PEG-1000 of the flame-retardant wood-based composite PCMs is 53.1–73.4%, which shows that it has good energy storage performance. At the same time, the flame-retardant wood-based composite PCMs still have good cycle reliability after 100 heating-cooling cycles. Due to the excellent light absorption properties of EG, the flame-retardant wood-based composite PCMs exhibit excellent photothermal conversion efficiency (68.1–80.0%), which has considerable application potential in solar energy utilization systems and thermal management.

Suggested Citation

  • Deng, Xunhe & Li, Cong & Sun, Xiaohan & Wang, Chengyu & Liu, Baosheng & Li, Yudong & Yang, Haiyue, 2024. "Flame-retardant wood-based composite phase change materials based on PDMS/expanded graphite coating for efficient solar-to-thermal energy storage," Applied Energy, Elsevier, vol. 368(C).
    • Handle: RePEc:eee:appene:v:368:y:2024:i:c:s0306261924008377
    DOI: 10.1016/j.apenergy.2024.123454
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