期刊
CHINESE CHEMICAL LETTERS
卷 32, 期 6, 页码 2027-2032出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.12.011
关键词
Supercapacitor; Metal oxide; Graphene oxide; Energy density; Cycling stability
资金
- National Natural Science Foundations of China [51772001]
- Key Laboratory of Environment-Friendly Polymer Materials of Anhui Province, Anhui University
This study reports a ternary composite of CoO-ZnO with different fractions of rGO grown on nickel foam, showing excellent electrochemical properties and large capacitance. The CZG-2 sample in a nanoreticular structure exhibits the best electrochemical performance.
The high specific capacitance along with good cycling stability are crucial for practical applications of supercapacitors, which always demands high-performance and stable electrode materials. In this work, we report a series of ternary composites of CoO-ZnO with different fractions of reduced graphene oxide (rGO) synthesized by in-situ growth on nickel foam, named as CZG-1, 2 and 3, respectively. This sort of binder-free electrodes presents excellent electrochemical properties as well as large capacitance due to their low electrical resistance and high oxygen vacancies. Particularly, the sample of CZG-2 (CoO-ZnO/ rGO 20 mg) in a nanoreticular structure shows the best electrochemical performance with a maximum specific capacitance of 1951.8 F/g (216.9 mAh/g) at a current intensity of 1 A/g. The CZG-2-based hybrid supercapacitor delivers a high energy density up to 45.9 Wh/kg at a high power density of 800 W/kg, and kept the capacitance retention of 90.1% over 5000 charge-discharge cycles. (c) 2021 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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