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Multifunctional F-doped TiO2 PCM microcapsules for visible-light-driven photocatalysis and latent heat storage

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  • Zhao, Aiqin
  • Xiao, Xi
  • Hu, Zhong-Ting
  • Zhu, Weiping
  • Yang, Jinglei
  • Yang, En-Hua

Abstract

This paper presented the fabrication of a multifunctional microcapsule, integrating visible-light-driven photocatalysis and latent heat storage capabilities. The core-shell structure incorporated a phase change material in the core, facilitating latent heat storage. Meanwhile the shell was composed of fluorine-doped TiO2, enabling photocatalysis under visible light. Different from conventional fabrication methods necessitating stringent conditions, this study employed a synthesis approach viable at low temperatures (50–90 °C) and ambient pressure. The resulting microcapsule exhibited high photocatalytic capability under visible light, which was able to fully degrade organic dye within 7 h exposure to visible light. Parametric studies indicate photocatalytic efficiency was enhanced with reduced capsule size and elevated fabrication temperature. Optimal conditions were observed at a capsule size of 100 μm and a fabrication temperature of 90 °C. Furthermore, the microcapsule possessed a high thermal storage capacity of 99.4%, indicating the effectiveness of the shell in safeguarding the core material during the phase change process without compromising its energy storage capacity. Even after 100 h of exposure to visible light, the microcapsule demonstrated outstanding thermal stability and durability.

Suggested Citation

  • Zhao, Aiqin & Xiao, Xi & Hu, Zhong-Ting & Zhu, Weiping & Yang, Jinglei & Yang, En-Hua, 2024. "Multifunctional F-doped TiO2 PCM microcapsules for visible-light-driven photocatalysis and latent heat storage," Applied Energy, Elsevier, vol. 359(C).
    • Handle: RePEc:eee:appene:v:359:y:2024:i:c:s0306261924000576
    DOI: 10.1016/j.apenergy.2024.122674
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    References listed on IDEAS

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    1. Chai, Luxiao & Wang, Xiaodong & Wu, Dezhen, 2015. "Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness," Applied Energy, Elsevier, vol. 138(C), pages 661-674.
    2. Liu, Huan & Wang, Xiaodong & Wu, Dezhen & Ji, Shengfu, 2019. "Morphology-controlled synthesis of microencapsulated phase change materials with TiO2 shell for thermal energy harvesting and temperature regulation," Energy, Elsevier, vol. 172(C), pages 599-617.
    3. Barzin, Reza & Chen, John J.J. & Young, Brent R. & Farid, Mohammed M., 2015. "Application of PCM underfloor heating in combination with PCM wallboards for space heating using price based control system," Applied Energy, Elsevier, vol. 148(C), pages 39-48.
    4. Jiang, Binbin & Wang, Xiaodong & Wu, Dezhen, 2017. "Fabrication of microencapsulated phase change materials with TiO2/Fe3O4 hybrid shell as thermoregulatory enzyme carriers: A novel design of applied energy microsystem for bioapplications," Applied Energy, Elsevier, vol. 201(C), pages 20-33.
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