Shape stable phase change composites based on MXene/biomass-derived aerogel for solar–thermal energy conversion and storage

摘要

? 2023 Elsevier LtdIn this study, a green, non-toxic, and renewable starch was selected to construct a three-dimensional (3D) biomass-derived aerogel to prepare a series of shape stable phase change composites (SSPCCs) by encapsulating organic phase change materials (PCMs), and the best encapsulation effect of SF-50 with ultralow density (0.0635 g/cm?3) and high continuous porosity on polyethylene glycol (PEG) was found to be 91.78 wt by comparing myristic acid (MA) and paraffin wax (PW). Moreover, the introduction of MXene, a functional two-dimensional filler in the aerogel skeleton, not only endows the SSPCCs with better light absorption ability, but also enhances the encapsulation ability of PEG. The adsorption rate of SF-Mxene-8 on PEG is 93.27 wt and the enthalpy is 164.92 J/g. In addition, its photothermal conversion rate is 76.9 and it still has stable solar energy absorption and thermal energy release ability after 200 photothermal conversions. The starch based aerogel in general will bring a new paradigm for PCM as a working medium for solar-thermal energy conversion and storage.