期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 55, 期 -, 页码 182-189出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.02.014
关键词
Cu2O; Co3O4; Hollow nanocube; Graphene; Composite
资金
- National Natural Science Foundation of China [51861005, 51861004]
- Innovation Project of Guangxi Graduate Education [YCSW2019149]
- Guangxi Natural Science Foundation [2017GXNSFDA198018]
Co3O4 is one of the most studied transition-metal oxides for use in energy-storage devices. However, its poor conductivity and stability limit its application. In this study, a facile method for anchoring Co3O4-encapsulated Cu2O nanocubes on porous carbon (PC) to form Cu2O@Co3O4/PC was developed. The Cu2O@Co3O4/PC composite exhibited superior electrochemical performance as a supercapacitor electrode material. The resultant supercapacitor delivered high specific capacitance (1096 F g(-1) at 1 A g(-1)), high rate capability (83 % retention at 10 A g(-1)), and excellent cycling stability (95 % retention of initial capacitance after 3000 cycles). Moreover, an asymmetric supercapacitor fabricated by coupling a Cu2O@Co3O4/PC positive electrode with a reduced graphene oxide negative electrode exhibited high energy density (32.1 W h kg(-1) at 700 W kg(-1)). Thus, our results demonstrate that Cu2O@Co3O4/PC is a promising electrode material for energy-storage devices. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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