期刊
ELECTROCHIMICA ACTA
卷 167, 期 -, 页码 412-420出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.03.098
关键词
electrochemical exfoliation; graphene/MnO2 nanocomposite; electrostatic self-assembly; supercapacitor
资金
- National Natural Science Foundation of China [21273085]
- Project of Guangzhou Science and Information Technology Bureau [2012J4300147]
- Natural Science Foundation of Guangdong Province, China [S2011010003416, S2013010012927]
- Project of Guangdong Province Science and Technology Bureau [2010B090400552]
- Fundamental Research Funds for the Central Universities [13lgjc10]
- Scientific Research Foundation of Graduate School of South China Normal University [2014ssxm30]
Layered graphene/manganese oxide (G/MnO2) nanocomposites for supercapacitor applications were prepared with a face-to-face electrostatic self-assembly method using high-quality graphene, which was obtained from the one-step electrochemical exfoliation of graphite. The results reveal that the graphene and MnO2 nanaosheets need to be oppositely charged for the electrostatic self-assembly process. The face-to-face contact between the MnO2 nanosheets and graphene can effectively improve the conductivity of MnO2 and prevent the restacking and agglomeration of graphene. In addition, the composites exhibit an electrochemical-activation behavior, and the ratio of MnO2/graphene in composites significantly influences the electrochemical performance. The G-2/MnO2 composite displays a specific capacitance of 319 F g(-1) at 0.2 A g(-1), and only 4.4% of the capacitance degrades after 10,000 cycles, which demonstrates the composite's excellent cycle stability. Furthermore, the composite features a high energy density of 31.5 Wh kg(-1) at a power density of 100 W kg(-1). This attractive performance makes it a promising candidate as an electrode material for supercapacitors. Remarkably, although the graphene content in G-4/MnO2 composite is the same, the specific capacitance reduced to 186 F g(-1) due to the different mixing times. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据