期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 540, 期 -, 页码 306-314出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.01.030
关键词
Selenide; Supercapacitor; Active phase; Rate capability; Cycling stability
资金
- National Natural Science Foundation of China [21808243, U1662119]
- National Key Research and Development Program of China [2017YFB0306600]
- Fundamental Research Funds for the Central Universities [17CX02061]
- Key Research and Development Program of Binzhou University [2017ZDL03]
- Doctoral Program of Binzhou University [2017Y05]
In this work, a series of NixCo1-xSe2 selenides are prepared with x ranging from 0 to 1 and investigated as electrode materials for supercapacitor. The sample Ni0.6Co0.4Se2 shows 1580 and 1205 F g(-1) at 1 and 20 A g(-1), respectively. At 10 A g(-1), 90% capacitance retention is sustained after 20,000 cycles. A Ni0.6Co0.4Se2-based asymmetric supercapacitor (ASC) is assembled and exhibits energy density of 44.1 and 36.8 Wh kg(-1) at power density of 691.3 and 15070.6 W kg(-1) and long stability. Systematic physicochemical/electrochemical analysis reveals that the high active MOOH (M = Ni, Co)/Ni0.6Co0.4Se2 phases generated by electrooxidation act as the actual active materials during the charge storage/release process. The collective effects of large ion-accessible active area, high conductivity and electrochemically active MOOH (M = Ni, Co)/Ni0.6Co0.4Se2 phases convincingly account for the remarkable performance, especially the excellent rate capability and stability. (C) 2019 Elsevier Inc. All rights reserved.
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