Preparation and characterization of highly efficient photothermal conversion and storage composites based on Cu2-xS

In order to improve the photothermal conversion performance of a phase change material (PCM) PEG2000, a photothermal conversion material Cu2-xS was introduced to enhance its light absorbance. The influence of S/Cu stoichiometry and Fe3+ doping modification ratio on the photoabsorption performance of Cu2-xS was studied. The composite with photothermal conversion performance was obtained by combining PEG2000. The results show that Cu2-xS (S2) doped with Fe/Cu stoichiometry ratio of 0.3:1 exhibits the best light absorption performance. Moreover, a small amount of additive of the modified Cu2-xS (Cu2-xFeyS, 1.0 wt%) can greatly increase photothermal conversion and energy storage efficiency. The prepared composite can meet the practical application in the field of solar photothermal conversion.