期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 819, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152939
关键词
Co3O4; Gem shape; Hydrothermal; Supercapacitor
资金
- School Foundation for North University of China [110246]
- Shanxi Science foundation of China [201801D221197]
- Shanxi Scholarship Council of China [2017-094]
- National Science Foundation of China [61501408]
- Shanxi '1311 project' Key Subject Construction [1331KSC]
In this work, a 3D gem shape Co3O4 nanomaterial using nickel foam (Ni foam) as substrate was synthesized as supercapacitor electrode. The morphology and structures of the Co3O4 were characterized by various test-methods including XRD, BET, FTIR, TG, SEM, TEM and XPS. The fabricated Co(3)O(4 )nano-material achieved an excellent capacitance of 1060.0 F g(-1) at 1 A g(-1) and a super-long cycling life with 99.6% retention rate after 5000 cycles at 8 A g(-1). Moreover, the as-fabricated Co3O4//AC supercapacitor, with the as-prepared Co3O4 as positive electrode and the activated carbon as negative electrode, delivered a high energy density (44.99 Wh kg(-1)) at the power density of 0.2 kW kg(-1). The superior performances were mainly due to the high specific surface area, the suitable pore structure, and the uniformed 3D gem shape morphology of the Co3O4 nanomaterials. This work is of great significance to the development of high-performance energy storage devices and even to other application fields such as photocatalysis and sensors. (C) 2019 Elsevier B.V. All rights reserved.
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