Octadecyl acrylate-based self-supporting elastic phase change framework materials for the enhancement of photovoltaic conversion efficiency

Abstract

Incorporating support structures into solid–liquid phase change materials (SLPCMs) addresses fluid dynamics challenges during phase transitions, albeit at the cost of reduced phase change enthalpy. We propose a novel approach for developing self-sustaining, porous phase change materials. This process begins with the fabrication of self-sustaining poly(acrylic acid) octadecyl ester aerogels through cross-linking polymerization and thermally induced phase separation (TIPS) followed by ambient drying to shape the aerogel. This aerogel demonstrates exceptional energy storage capacity, impressive room-temperature elasticity, and significant load-bearing strength. Leveraging this aerogel as a scaffold, we employ a ‘one-step’ technique to produce phase change gels (PCGs). This method, in which EI functions both as a solvent and as SLPCMs, yields PCGs with a high latent heat capacity of 192 J g⁻¹, outstanding phase change elasticity, and structural stability, proving highly effective in photoelectric thermal management. Notably, the ‘one-step’ process for fabricating self-supporting PCGs circumvents conventional steps like solvent extraction and phase change material absorption in traditional porous foam production. This simplification streamlines manufacturing and facilitates the large-scale production of phase change materials that are morphologically stable, possess high latent heat, and exhibit superior mechanical properties.