Core-shell-like structured graphene aerogel encapsulating paraffin: shape-stable phase change material for thermal energy storage
Core-shell-like structured graphene aerogel encapsulating paraffin: shape-stable phase change material for thermal energy storage
复制标题
核壳结构石墨烯气凝胶封装石蜡：用于热能储存的形状稳定相变材料
DOI：
10.1039/c4ta05448b
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Feng, Jiachun
中科院分区：
文献类型：
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作者：
Ye, Shibing;Zhang, Qinglong;Feng, Jiachun
未来几年，储能材料的发展对可持续能源基础设施的发展至关重要。本文通过改进水热法制备了石墨烯和石蜡复合相变材料（PCM）。在水热过程中，氧化石墨烯薄片被还原并自组装成由许多空心石墨烯细胞组成的三维石墨烯气凝胶，石蜡同时以微米级液滴的形式包裹在细胞中。所制得的核壳状结构复合PCM具有高石蜡包封率、大相变焓和优异的循环性能。由于独特的封装结构和连续的石墨烯网络在基体中，这种复合PCM具有良好的形状稳定性能，可以防止石蜡在其熔点以上的泄漏。此外，它继承了嵌入石墨烯固有的导热性和导电性，因此与纯石蜡相比，它的导热性和导电性都有所提高。这种新型复合PCM可以实现高效的热能储存，并显示出直接用作实际储热装置的潜力，无需容器。
The development of energy storage materials is critical to the growth of sustainable energy infrastructures in the coming years. Here, a composite phase change material (PCM) based on graphene and paraffin was designed and prepared through a modified hydrothermal method. Graphene oxide sheets were reduced and self-assembled into three-dimensional graphene aerogels consisting of numerous hollow graphene cells, and paraffin was simultaneously encapsulated into the cells in the form of micrometer-scale droplets during the hydrothermal process. The resulting core-shell-like structured, composite PCM exhibits a high encapsulation ratio of paraffin, large phase change enthalpy, and excellent cycling performance. Due to the unique encapsulated structure and continuous graphene network in the matrix, such a composite PCM holds a good shape-stable property, which prevents the leakage of paraffin above its melting point. In addition, it inherits the intrinsic thermally and electrically conductive nature of the embedded graphene, and thus shows enhanced thermal and electrical conductivity compared to pure paraffin. This novel composite PCM can realize efficient thermal energy storage and demonstrates the potential to be directly used as an actual thermal storage device without containers.