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<p>This study grafted a bulky azobenzene derivative, 4′-aminoazobenzene-4-sulfonic acid (AABS), onto the surface of ZIF-90, thereby preparing a metal-organic framework material, ZIF-90-AABS (ZIF-AABS), with photothermal conversion effects. The template-like effect on the surface of ZIF-AABS enables the reversible <i>cis-trans</i> isomerization of AABS, allowing ZIF-AABS to achieve photochemical energy storage of 5.1 J g<sup>−1</sup>. Additionally, since AABS is mainly grafted on the surface of ZIF-90, ZIF-AABS retains the crystal structure of ZIF-90 and thus still can encapsulate and adsorb phase change materials (PCMs). By infiltrating the porous structure with the octadecyl alcohol (OD), a composite PCMs, OD/ZIF-AABS, was successfully developed, which effectively realizes phase change energy storage. The latent heat storage energy of OD/ZIF-AABS with maximum OD loading was 121.3 J g<sup>−1</sup>, and no significant performance degradation was observed after 50 melting/solidifying cycles. This work further expands the application scope of azobenzene and promotes the development of MOFs-based composites for solar energy storage.</p>

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Metal organic frameworks with surface-grafted azobenzene for energy storage

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Kai Wang,
  • Mengmeng Qin,
  • Can Chen,
  • Shuo Wang,
  • Wei Feng

摘要

This study grafted a bulky azobenzene derivative, 4′-aminoazobenzene-4-sulfonic acid (AABS), onto the surface of ZIF-90, thereby preparing a metal-organic framework material, ZIF-90-AABS (ZIF-AABS), with photothermal conversion effects. The template-like effect on the surface of ZIF-AABS enables the reversible cis-trans isomerization of AABS, allowing ZIF-AABS to achieve photochemical energy storage of 5.1 J g−1. Additionally, since AABS is mainly grafted on the surface of ZIF-90, ZIF-AABS retains the crystal structure of ZIF-90 and thus still can encapsulate and adsorb phase change materials (PCMs). By infiltrating the porous structure with the octadecyl alcohol (OD), a composite PCMs, OD/ZIF-AABS, was successfully developed, which effectively realizes phase change energy storage. The latent heat storage energy of OD/ZIF-AABS with maximum OD loading was 121.3 J g−1, and no significant performance degradation was observed after 50 melting/solidifying cycles. This work further expands the application scope of azobenzene and promotes the development of MOFs-based composites for solar energy storage.