Improving the light-to-thermal conversion properties of phase change materials (PCMs) is conducive to the development of their applications in solar thermal energy storage systems. In this work, a porous structure of expanded graphite (EG) modified Ni-MOF was synthesized by hydrothermal synthesis, and scattered in CH₃COONa‧3H₂O (SAT) by a physical blending and impregnation method to obtain a novel composite phase change material with reinforce light-to-thermal conversion. The resulting composite PCM showed that the latent heat of composite PCM was 166.6J/g, the supercooling temperature was reduced to 2.5 °C. The porous network structure formed by the close combination of EG and MOF effectively enhanced the heat transfer rate of composite PCM. The thermal conductivity of composite PCM was about 3.21 times that of pure SAT. Furthermore, the composite PCM showed good thermal cycling performance and excellent light-to-thermal conversion properties, which could be suggested as a promising candidate for solar thermal storage systems.

提高相变材料（PCMs）的光热转换性能有利于其在太阳能热储能系统中的应用发展。本工作采用水热合成法合成了多孔结构的膨胀石墨（EG）改性Ni-MOF，并分散在CH ₃ COONa‧3H _{2 中。}O（SAT）通过物理共混和浸渍方法获得具有增强光热转换的新型复合相变材料。所得复合PCM显示复合PCM潜热为166.6J/g，过冷温度降至2.5℃。EG与MOF紧密结合形成的多孔网络结构有效提高了复合PCM的传热速率。复合 PCM 的热导率约为纯 SAT 的 3.21 倍。此外，复合相变材料表现出良好的热循环性能和优异的光热转换性能，可作为太阳能蓄热系统的候选材料。