▎ 摘　　要

Phase change materials (PCM) have received widespread attention due to their unique energy storage and release characteristics. However, its low thermal conductivity and unstable shape limite their applications. In this paper, a high-strength 3D graphene skeleton is constructed using the in-situ polymerization and carbonized process to improve the shape stability and thermal conductivity of the paraffin based PCM. The thermal conductivity of the PCM is found to increase to 0.88 W/mK at the loading of about 15.1 wt% multilayer-graphene (MG), 4 times higher compared to that of pure paraffin. Moreover, the 3D framework exhibits a significantly enhanced compression strength as high as 410.83 KPa while maintain the porous structure due to interaction between MG and carbon layers. This means that the skeleton can provide better physical adsorption to prevent the leakage of liquid paraffin, and the cycle stability of phase change materials are ensured. The results indicate that the shape-stable PCMs as supported by graphene sponges are potentially to be widely used for thermal energy conversion and storage applications.