期刊
ELECTROCHIMICA ACTA
卷 194, 期 -, 页码 377-384出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.02.047
关键词
CoO; MnO2; Nanoarray; Core-shell; Asymmetric supercapacitors
资金
- National Natural Science Foundation of China [NSFC. 21501152, 21571159, 21441003, 21374106, 21271159]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT15R61]
- Foundation of Zhengzhou University of Light Industry [2014BSJJ054]
- Projects for Henan Province science and technology cooperation [142106000050]
- Key Program of Henan Province for Science and Technology [162102210212, 132102210424]
A new core-shell nanostructure of CoO@MnO(2)nanowire@nanosheetarrays(NNSs) was designed and directly grown on a 3D nickel foam by a simple two step solution method combined with a post annealing treatment in Ar gas. The MnO2 nanosheets can grow directly on the CoO precuor nanowires without any pretreatment, and its thickness on the CoO nanowire arrays (NAs) can also be tailored by easily adjusting the second step hydrothermal time. When acting as a electrochemical supercapacitor, the CoO@MnO2 NNAs delivers a highly enhanced specific capacitance of 3.03 F cm(-2) (about 1515 F g(-1)) with a wide potential window of 0.8 V at 2.0 mA cm(-2), which is superior to most reported Co3O4 based core-shell NNAs supercapacitive electrodes. An asymmetric supercapacitor devices based on these CoO@MnO2 NNAs and aqueous electrolyte showed with a high-energy density of 0.37 mWh cm(-2) at a power density of 1.7 mW cm(-2), a high power density of 34.4 mW cm(-2) at 0.20 mWh cm(-2) and a long-term cycling ability, implying its great potential application in high-performance electrochemical supercapacitor. (C) 2016 Elsevier Ltd. All rights reserved.
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