期刊
MATERIALS LETTERS
卷 160, 期 -, 页码 171-174出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.07.110
关键词
Nickel cobaltate; Nanoparticles; Ball-milling method; Electrical properties; Supercapacitor
资金
- Chinese National Science Funds [51202094]
- Natural Science Foundation of Jiangsu Education Committee of China [13KJB480004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A facile ball-milling process followed by a thermal treatment is developed for the large-scale synthesis of ultrasmall NiCo2O4 nanoparticles ( < 20 nm). The uniform NiCo2O4 nanoparticles exhibit high specific capacitance of 720.04 F g(-1) at 1 A g(-1) and 477.36 F g(-1) at 20 A g(-1), respectively. The specific capacitance retention rate reaches 97.3% after 2000 cycles, demonstrating its excellent cycling stability. The superior electrochemical performance is mainly attributed to the ultrasmall nanosize, which provides large electrode-electrolyte contact area and benefits electrons and ions transportation during the redox process. This method of preparing NiCo2O4 nanoparticles is very simple, yet effective, and it could be applied in the large-scale synthesis of other high-performance binary metal oxides electrode materials for electrochemical capacitors. (C) 2015 Elsevier B.V. All rights reserved.
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