Abstract A series of composite phase change materials (cPCMs) are fabricated through the one-pot method with the epoxidized methoxy polyethylene glycol (EmPEG) as the thermal energy unit and polydopamine-reduced graphene oxide (PDA-rGO) nanosheets as the interfacial enhancement. Structure and thermal properties such as phase change enthalpy, thermal repeatability, and light-to-thermal conversion capacity of EmPEG/PDA-rGO cPCMs with PDA-rGO content varying from 0.5 to 4 wt% have been detailed discussed. A superior stabilization performance of EmPEG/PDA-rGO cPCMs to pristine EmPEG is demonstrated based on the interfacial action from the incorporated PDA-rGO nanosheets. EmPEG/PDA-rGO-3 presents good structure-stabilized behavior after 100 heating-cooling cycles, and no liquid leakage appears up to 105 °C. In the meantime, EmPEG/PDA-rGO-3 illustrates a stable thermal reliability and thermal charging/discharging rate, and the light-to-thermal conversion efficiency reaches 96% under the 100 mW/cm2 irradiation. Thus, the structure-stabilized EmPEG/PDA-rGO cPCMs tuned by the interfacial interaction demonstrates the promising application in the field of the thermal energy storage and solar energy conversion.

中文翻译：

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由聚多巴胺官能化氧化石墨烯定制的环氧化甲氧基聚乙二醇复合相变材料的热性能和形状稳定性

摘要 以环氧化甲氧基聚乙二醇（EmPEG）为热能单元，聚多巴胺还原氧化石墨烯（PDA-rGO）纳米片为界面增强材料，通过一锅法制备了一系列复合相变材料（cPCMs）。已经详细讨论了 PDA-rGO 含量从 0.5 到 4 wt% 不等的 EmPEG/PDA-rGO cPCM 的结构和热性能，例如相变焓、热重复性和光热转换能力。基于结合的 PDA-rGO 纳米片的界面作用，证明了 EmPEG/PDA-rGO cPCMs 对原始 EmPEG 的优异稳定性能。EmPEG/PDA-rGO-3 在 100 次加热-冷却循环后表现出良好的结构稳定行为，并且在高达 105 °C 时不会出现液体泄漏。同时，EmPEG/PDA-rGO-3 具有稳定的热可靠性和热充放电速率，在 100 mW/cm2 照射下光热转换效率达到 96%。因此，通过界面相互作用调节的结构稳定的 EmPEG/PDA-rGO cPCMs 在热能储存和太阳能转换领域具有广阔的应用前景。