期刊
VACUUM
卷 174, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2020.109219
关键词
Supercapacitor; Co3O4; Ultrafast charge/discharge; Sintering treatment; Tertiary hierarchical architecture
资金
- National Natural Science Foundation of China [51772176, 51971121, 51902189, 51801114]
- Distinguished Taishan Scholars in Climbing Plan [tspd20161006]
- Shanghai foundation for new research methods [17142201600]
The fast charge/discharge ability is very important for electric energy storage devices. Here, Co3O4 electrode with flower-wire-nanoparticle tertiary hierarchical architecture for ultrafast charge/discharge rate supercapacitor is developed via a facile and scalable hydrothermal method and subsequent sintering treatment. The as-prepared Co3O4 electrode exhibits an outstanding rate performance of 95.6% capability at 80 times current density from 0.5 A g(-1) to 40 A g(-1) and a good cycling stability of 98.5% retention after 2000 charge/discharge cycles at the current density of 2 A g(-1). The Co3O4//AC asymmetric supercapacitor reveals an energy density of 16.25 Wh kg(-1) at a power density of 7500 W kg(-1). These impressive electrochemical behaviors suggest that such Co3O4 tertiary hierarchical architecture holds great promise for high-rate energy storage devices.
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