含Co3O4自组装的3D石墨烯气凝胶及其电容器性能研究

Co3O4 Embedded in Self-assembled Three-dimensional Graphene Aerogel Networks for High-performance Supercapacitor

设计了一种简单的通过一步水热法制备三维（3D）多孔的Co3O4/石墨烯气凝胶（GA）材料。因石墨烯（Graphene）所具有互相连通的三维孔道以及Co3O4纳米微球丰富多孔结构,Co3O4/GA表现出良好的导电性和赝电容性,是一种优异的用于能量储存装置的电极材料。该Co3O4/GA复合物拥有高比表面积（139 m^2/g）和较宽的孔径分布（约为1-100nm）。单纯GA的比电容值为175.5 F/g,由于Co3O4微球的引入,使复合物气凝胶的比电容值得到了显著提升,在电流密度为1 A/g时,比电容值高达1456.3 F/g。以Co3O4/GA为正极、GA为负极、LiOH/PVA为凝胶电解质组装成全固态非对称超级电容器（SASC）,当功率密度为648.9 W/kg时,该SASC拥有优异的能量密度（68.1 W·h/kg）,说明此Co3O4/GA是一种优异的超级电容器电极材料。

A facile one-step hydrothermal strategy has been developed to prepare 3 D porous Co3O4/graphene aerogel（Co3O4/GA）.Due to combination of a highly interconnected 3 D network framework of GA and Co3O4 microspheres,Co3O4/GA electrode exhibits exceptional electrical conductivity and pseudocapacitance to make it an excellent material for energy storage devices.The Co3O4/GA composites possess a high specific surface area of 139 m^2/g and a broad pore size distribution of 1 - 100 nm.Although GA shows a high specific capacitance of 175. 5 F/g,the presence of Co3O4 microspheres are found remarkably effective in enhancing this of the composite aerogel up to 1 456. 3 F/g at 1 A/g. Furthermore,the combination of the two aerogel electrodes with Li OH/PVA gel electrolyte endow our all-solid-state asymmetric supercapacitor（SASC） of Co3O4/GA//GA a stable cycling performance,and superior electrochemical performance with an energy density of 68. 1 W·h/kg at a power density of 648. 9 W/kg.These results indicate that Co3O4/GA could be a potential candidate in the field of supercapacitors.