Abstract Three-dimensional (3D) graphene-reinforced structural materials with excellent solar-thermal conversion, mechanical and thermal transfer properties present attractive prospects for the fabrication of high-performance composite phase change materials (PCMs). Herein, multifunctional 3D continuous sponge frameworks wrapping with reduced graphene oxide (rGO) are facilely prepared via simply circular impregnation and in-suit reduction process. Further, the stable combination of 3D support material and phase change matrix through vacuum melting infiltration can successfully obtain the rGO@sponge framework/paraffin wax (rGO@SF/PW) composite shape-stabilized PCMs. As an advanced energy conversion and storage PCMs, the rGO@SF/PW achieves efficient solar-thermal conversion effciency of 85%, excellent energy storage properties (phase-change enthalpy of 170.4 J/g for the loading amount of 90 wt%), high thermal transfer performance and good cycling thermal stability. Based on the comprehensive performances of the rGO@SF/PW, domestic storage systems for solar-thermal water are designed to broaden the application of PCMs in the solar-thermal energy area.

中文翻译：

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三维rGO@海绵骨架/石蜡复合形状稳定相变材料，用于太阳能热能转换和存储

摘要 具有优异的太阳能热转换、机械和热传递性能的三维 (3D) 石墨烯增强结构材料为高性能复合相变材料 (PCM) 的制造提供了诱人的前景。在此，通过简单的圆形浸渍和套装还原过程轻松制备了用还原氧化石墨烯（rGO）包裹的多功能 3D 连续海绵框架。此外，3D支撑材料和相变基质通过真空熔融渗透的稳定结合可以成功获得rGO@sponge骨架/石蜡（rGO@SF/PW）复合形状稳定的PCM。作为一种先进的能量转换和存储 PCMs，rGO@SF/PW 实现了 85% 的高效太阳能热转换效率，优异的储能性能（负载量为 90 wt% 时相变焓为 170.4 J/g）、高传热性能和良好的循环热稳定性。基于rGO@SF/PW的综合性能，设计了家用太阳能热水储存系统，以拓宽PCMs在太阳能热能领域的应用。