Efficient solar–thermal energy conversion and storage demand materials that combine high latent heat with multifunctional performance were observed. Here, we report electrospun polyester‐based phase change material (PCM) mats capable of simultaneous thermal energy storage and photothermal conversion. Among a series of PCMs, PPCM1218 (from 1,12‐dodecanediol and octadecanedioic acid) showed the highest latent heat (157 J/g, melting point 90.6°C) and was incorporated into flexible, bead‐free mats via blending with polyamide 11 to prevent leakage. Mats with high PCM loading retained up to 132 J/g enthalpy while maintaining mechanical integrity. Functionalization with biochar, graphene, or polypyrrole (PPy) enhanced stiffness, electrical, and thermal conductivity, with PPy‐coated mats achieving 0.51 W/m·K and 18.5 S/m. Under 1.5 sun irradiation, surfaces exceeded 90°C, fully melting the PCM and demonstrating stable energy storage and release over 100 thermal and photothermal cycles. This approach offers a versatile platform for multifunctional electrospun mats suitable for high‐temperature energy storage, solar‐driven water purification, and thermal management applications.
Baniasadi et al. (Wed,) studied this question.