Coal gasification slag-based-sodium acetate trihydrate composite phase change materials for solar thermal energy storage

Abstract

Sodium acetate trihydrate (SAT) is an extremely potential low-temperature phase change material (PCM) in the solar power absorption, residual heat recovery, and other fields. Using coal gasification slag as a matrix for the sorption of SAT not only effectively solves the liquid leakage problem that occurs when the material is transferred from the solid phase to the liquid phase and but also improve the photothermal performance of the PCM, which is both environmentally friendly and economically valuable. A shape-stabilized coal gasification slag/sodium acetate trihydrate composite phase change material was therefore created in this work using the vacuum impregnation process, and its characteristics were examined. It was found that CGS is chemically compatible with SAT, and a CGS loading on SAT is 67.99%. on SAT results in a CPCM with better heat stability. Furthermore, the CPCM's latent heat could reach up to 171 J g⁻¹, and it exhibited excellent capability for solar thermal conversion, with an photothermal conversion efficiency of 77.8%.