Flame-retardant wood-based composite phase change materials based on polydopamine functionalized carbon dots for efficient solar-to-thermal energy storage

作者：Yushan Liu, Xiongxiong Cao, Mengfan Yang, Wei Meng, Jingya Mao, Jingjing Sun, Huizhi Xiang, Haihua Wang · 发表于：Advanced Composites and Hybrid Materials · 年份：2025 · DOI：10.1007/s42114-025-01467-y · 被引用次数：12 · 研究领域：Phase Change Materials Research、Solar-Powered Water Purification Methods、Thermal Radiation and Cooling Technologies

To address the low efficiency and flammability of wood-based phase change materials (WPCMs) in solar energy storage, this study developed a series of WPCMs (PEG/TPP/DW-P) with both flame retardancy and solar-thermal energy storage properties by vacuum-impregnating polyethylene glycol (PEG), triphenyl phosphate (TPP), and polydopamine (PDA)-functionalized carbon dots (PCDs) into delignified wood (DW). In addition to surface tension and capillary forces, the polyhydroxy structures of cellulose and hemicellulose in DW formed strong hydrogen bonds with PCDs, PEG, and TPP, further hindering the leakage of phase change materials (PCMs) during the “solid–liquid” phase Change process. The leakage rate was lower than that of most studies, at 4.67%, and the composite material could still maintain shape stability after 150 heating–cooling cycles. The PDA with a larger specific surface area in PCDs conducted efficient electron transfer with the carbon dots (CDs) loaded on it, resulting in the occurrence of non-radiative transitions. The photothermal energy storage efficiency was 90.68%, far exceeding those of pure CDs. The P-containing PCM-TPP synergistically interacted with the N in PCDs to generate a flame-retardant carbon layer. Compared with PEG/DW, the peak heat release rate and total heat release of PEG/TPP/DW-P were reduced by 28.19% and 13.45%, respectively. We also explored the practical application of WPCMs in simulating roofs, which showed good flame-retardant and thermal insu...