Manganese Dioxide/Ant-Nest-Like Hierarchical Porous Carbon Composite with Robust Supercapacitive Performances

作者：Qun Lü, Xianyou Wang, Xianyou Wang, Manfang Chen, Bing Lü, Meihong Liu, Ting Xing, Wang Xingyan, Wang Xingyan · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2018 · DOI：10.1021/acssuschemeng.7b04492 · 被引用次数：18 · 研究领域：Supercapacitor Materials and Fabrication、Advancements in Battery Materials、Advanced battery technologies research

Fullerenes (C 60 ) are made of sp 2 -hybridized carbon atoms, like carbon nanotubes and graphene. Herein, C 60 is sheared by chemical methods, involving alkali solution reactions that start to break carbon–carbon bonds, and then, the MnO 2 /three-dimensional ant-nest-like hierarchical porous carbon composite (MnO 2 /ANHPC) is successfully prepared. ANHPC has the ant-nest-like hierarchical porous structure, and MnO 2 is deposited on the surface of ANHPC. The MnO 2 /ANHPC composite reveals a high specific capacitance of 662 F g –1 at 1 A g –1 since it is the combination of both double-layer capacitances of ANHPC and pseudocapacitance of MnO 2 . The symmetric supercapacitor using the MnO 2 /ANHPC composite as the active material shows excellent rate performance and outstanding cycle stability (with 93.4% capacity retention rate after 5000 cycles at 1 A g –1 ) as well as a remarkable energy density of 21.5 Wh kg –1 . The improved supercapacitive performance is closely related with the integrated advantage of the 3D ant-nest-like hierarchical porous structure of ANHPC, stacked graphene sheets of linked hexagonal rings after chemically sheared C 60, and pseudocapacitance behavior of MnO 2 . Therefore, the design and preparation of the MnO 2 /ANHPC composite is a promising strategy for the active material of a high performance supercapacitor.