Development of photoactive chemical heat storage (PCHS) materials that can be isomerized without ultraviolet light and have outstanding storage performance as well as high rate heat output capability under low temperature conditions is a core issue for effective solar thermal conversion. In this study, we report a novel PCHS material by attaching ortho-tetrafluorinated azobenzene (Azo_TF) onto reduced graphene oxide (rGO) for photothermal conversion and storage. By applying the strategy of separating the n → π* transition of two different configurations of Azo_TF to the field of PCHS materials, this Azo_TF-rGO composite not only realizes the isomerization with visible light for two configurations with a long life cycle, but also exhibits excellent fatigue resistance and low temperature high rate heat output capability, which greatly increases its exploitation value. Moreover, the Azo_TF-rGO composite also shows remarkable heat storage density (Max. 345.8 kJ kg⁻¹), power density (Max. 2401.4 W kg⁻¹) attribute to the intermolecular hydrogen bond as well as the strong intermolecular interactions arise from the high attachment density. This new Azo_TF-rGO PCHS material may paves a new way for more effective and efficient solar thermal energy conversion and storage.

开发无需紫外光即可异构化、具有出色存储性能和低温条件下高倍率热输出能力的光敏化学蓄热（PCHS）材料是有效太阳能热转换的核心问题。在这项研究中，我们通过将邻四氟偶氮苯 (Azo _TF ) 连接到还原氧化石墨烯 ( rGO ) 上来报告一种新型 PCHS 材料，用于光热转换和存储。通过将两种不同构型的 Azo _TF的 n → π* 跃迁分离策略应用于PCHS 材料领域，该 Azo _TF-rGO复合材料不仅实现了两种构型的可见光异构化，寿命周期长，而且具有优异的抗疲劳性和低温高倍率热输出能力，大大增加了其开发价值。此外，Azo _TF -rGO 复合材料还显示出显着的储热密度（最大 345.8 kJ kg ^-1）、功率密度（最大 2401.4 W kg ^-1）归因于分子间氢键以及强分子间相互作用产生的高附着密度。这种新的 Azo _TF -rGO PCHS 材料可能为更有效和高效的太阳能热能转换和存储铺平了道路。