Multifunctional phase change composites, which have both high photo-thermal conversion capability and high latent-heat capacity, are in great demand for large number of applications. In this work, a shape-stabilized reduced graphene oxide sponge-based phase change composite that has reduced graphene oxide decorated melamine sponge as a support and paraffin wax as a filler was fabricated. Because of the lipophilicity of the reduced graphene oxide, paraffin wax is well adsorbed on the skeleton of the sponge. The loading percentage of paraffin wax could reach up to ~98%. Compared to pure sponge, the anti-leakage ability of the composite showed great improvements. The melting temperature and latent heat of the composite was 56 °C and 143.0 J/g, respectively. The reduced graphene oxide also gave the prepared phase change composites good solar absorption efficiencies that reached 95%. Under solar light irradiation, the composites could effectively harvest and convert solar energy into thermal energy. The phase change thermal storage efficiency reached up to 88.7%. Based on the heat storage characteristics of the phase change composites, a solar-driven thermoelectricity experiment was conducted, and results showed that the thermal energy was stored in the phase change materials and released over an elongated period, during which the open circuit voltage reached to 1.30 V. Therefore, the multifunctional phase change composites have potential for applications in various sustainable uses, including as solar thermal-energy storage, and waste-heat recovery.

具有高的光热转换能力和高的潜热能力的多功能相变复合材料对大量应用具有巨大的需求。在这项工作中，制造了形状稳定的还原氧化石墨烯海绵基相变复合材料，该复合材料具有还原氧化石墨烯装饰的三聚氰胺海绵作为载体和石蜡作为填料。由于还原的氧化石墨烯的亲脂性，石蜡被很好地吸附在海绵的骨架上。石蜡的负载百分比可以达到〜98％。与纯海绵相比，该复合材料的抗渗漏能力有了很大的提高。该复合材料的熔融温度和潜热分别为56℃和143.0J / g。还原的氧化石墨烯也使所制备的相变复合材料具有良好的日光吸收效率，达到了95％。在太阳光照射下，复合材料可以有效地收集太阳能并将其转化为热能。相变储热效率达到88.7％。根据相变复合材料的储热特性，进行了太阳能驱动的热电实验，结果表明，热能存储在相变材料中并长时间释放，在此期间，开路电压达到1.30V。因此，多功能相变复合材料具有在各种可持续用途中的应用潜力，包括太阳能热能存储和废热回收。在太阳光照射下，复合材料可以有效地收集太阳能并将其转化为热能。相变储热效率达到88.7％。根据相变复合材料的储热特性，进行了太阳能驱动的热电实验，结果表明，热能存储在相变材料中并长时间释放，在此期间，开路电压达到1.30V。因此，多功能相变复合材料具有在各种可持续用途中的应用潜力，包括太阳能热能存储和废热回收。在太阳光照射下，复合材料可以有效地收集太阳能并将其转化为热能。相变储热效率达到88.7％。根据相变复合材料的储热特性，进行了太阳能驱动的热电实验，结果表明，热能存储在相变材料中并长时间释放，在此期间，开路电压达到1.30V。因此，多功能相变复合材料具有在各种可持续用途中的应用潜力，包括太阳能热能存储和废热回收。