Abstract As research on phase change materials advances for solar energy applications, composite PCMs face growing demands for enhanced thermal conductivity, mechanical strength, and heat transfer efficiency. In this work, a porous carbon skeleton derived from phenolic resin offers over 1 MPa compressive strength and high‐temperature stability. After impregnation with polyethylene glycol, the resulting composite phase change material exhibits a thermal conductivity of 0.79 W/(m·K), four times that of pure PEG, together with good thermal stability and 66.2% photothermal conversion efficiency.
Guo et al. (Sun,) studied this question.