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Sea urchin-like CuCo2S4 microspheres with a controllable interior structure as advanced electrode materials for high-performance supercapacitors

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Abstract

The rational construction of a supercapacitor electrode structure that realizes high specific surface area, good cycling stability and high capacitance on a gravimetric basis is a basic concern but it is difficult to meet the commercial standards due to many fundamental challenges. Here, hierarchical CuCo2S4 microspheres, which possess urchin-like overall morphology, porous nanotubes and controlled inner structures, can be obtained from a hydrothermal process and a subsequent sulfurization process by changing the organic species during the hydrothermal process. Benefiting from the hollow urchin structure, the hollow urchin-like CuCo2S4 possesses a much-improved surface area to provide more active sites and maintain sufficient contact with the electrolyte. As a result, the hollow urchin-like CuCo2S4 exhibits a high specific capacitance of 1069 F g−1 at a current density of 1 A g−1, a high rate capacity of 61.2% retention and a good cycling stability of 93.7% retention after 10 000 cycles. Moreover, a hollow urchin-like CuCo2S4//activated carbon hybrid supercapacitor device is assembled, which shows a high energy density of 49.8 W h kg−1 at a power density of 4000 W kg−1, and an excellent cycling stability of 88% retention after 5000 cycles. This facile method for the fabrication of hierarchically designed electrode materials offers the possibility for high-performance supercapacitors.

Graphical abstract: Sea urchin-like CuCo2S4 microspheres with a controllable interior structure as advanced electrode materials for high-performance supercapacitors

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Publication details

The article was received on 02 Oct 2019, accepted on 22 Nov 2019 and first published on 22 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01269A
Inorg. Chem. Front., 2019, Advance Article

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    Sea urchin-like CuCo2S4 microspheres with a controllable interior structure as advanced electrode materials for high-performance supercapacitors

    H. Jia, Y. Cai, Z. Wang, X. Zheng, C. Li, H. Liang, J. Qi, J. Cao, J. Feng and W. Fei, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI01269A

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