期刊
ELECTROCHIMICA ACTA
卷 364, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137265
关键词
Leaf-like Co3O4@MnO; Extra-high output potential; Asymmetric supercapacitor; Core-shell structure
资金
- National Natural Science Foundation of China [51572202]
- National Science Foundation of Jiangsu Province [BK20171234]
- Foundation of Science and Technology on Plasma Physics Laboratory [6142A0403050617]
The attempt of high output potential character has always been an enormous challenge for water-based supercapacitors. In this paper, we first synthesize leaf-like Co3O4@MnO2 nanosheets on the carbon cloth fibers (Co3O4@MnO2CC) with hierarchical core-shell structure via a facile chemical bath deposition at low temperature. This leaf-like Co3O4@MnO2 nanosheets not only afford the advantage of ultra-high output potential (1.2 vs (Ag/AgCl)/V), but also carry the superiorities of ultra-high specific capacitance (616.7 F g(-1) at 2 A g(-1)) and remarkable cyclic stability (83.1% retention after 10000 cycles at 20 A g(-1)). The asymmetrical supercapacitor, assembled by using Co3O4@MnO2@CC-90 (CoMn@CC-90) as cathode and active carbon (AC) as anode, exhibits multiple merits of extra-high output potential (2.2 V vs AC/V), splendid specific energy (54.71 W h kg(-1) at power density of 1.06 k W kg(-1)) and long cycle life (86.3% capacitance retention after 10000 cycles). Our work offers one novel kind of reference for water-based supercapacitors with both characteristics of high output potential and high specific capacitance. (C) 2020 Elsevier Ltd. All rights reserved.
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