At present, society is facing energy and environmental problems and composite phase change materials applied to thermal energy storage technology are attracting attention. The shape-stabilized composite phase change materials PEG4000@Ag/PANI with good cycling stability are prepared by low temperature redox polymerization and vacuum impregnation method. In the samples, polyaniline aerogel (PANI) is used as the support skeleton, polyethylene glycol 4000 (PEG4000) as the phase change material and silver nanowires (AgNWs) as the thermally conductive reinforcing filler. The high porosity of aerogel and the capillary and hydrogen bonding forces between PEG4000 and the matrix material can realize high energy storage density, meanwhile the maximum loading of phase change composites can reach 94.17% (melting enthalpy is 165.17 J·g-1 and solidification enthalpy is 152.77 J·g-1). AgNWs and PANI aerogel jointly build the thermal conductivity pathway to improve the thermal conductivity of the phase change composite materials, (the maximum thermal conductivity is 0.45 W·m-1·K-1, which is 80% higher than that of pure PEG4000, and the melting enthalpy is 128.03 J·g-1, the solidification enthalpy is 116.86 J·g-1). With the excellent light absorption ability of AgNWs and polyaniline, the photo-thermal conversion efficiency of the prepared phase change composites reaches 90.61%. The shape-stabilized composite phase change materials with high energy storage density, high photo-thermal conversion capacity and high thermal conductivity were successfully prepared, which provides new ideas for the preparation of new composite phase change materials.
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