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Issue 16, 2017
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Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors

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Abstract

Sulphospinel materials, such as MnCo2S4, are being widely investigated as a promising class of candidates for energy storage. The low electric conductivity and low surface area derived by the conventional processes have however limited their wide usage as a class of low-cost materials for energy storage. In this work, sulphospinel MnCo2S4 nanostructures have been rationally synthesised through a carefully controlled sulphurization process, which expresses a desirable mesoporous feature with high electrical conductivity. They show much better electrical conductivity and pronounced improvement in the electrochemical performance with a high capacitance (938 F g−1 at 20 A g−1) and excellent cycling stability, where the specific capacitance could be retained at 95% of its original value after 5000 charge–discharge cycles. To further demonstrate the great potential of sulphospinel materials, a full-type supercapacitor was assembled with MnCo2S4 on carbon cloth as the positive electrode and a (Porous Carbon Polyhedron) PCP/rGO hydrogel as the negative electrode. The full cell shows a high energy density of 43 W h kg−1 at a power density of 0.801 kW kg−1, and 16.2 W h kg−1 can be retained at a power density of 26.5 kW kg−1. Excellent cycling stability is also achieved with 87% retention after 10 000 charge–discharge cycles, demonstrating great potential for next-generation high performance supercapacitors.

Graphical abstract: Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors

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Publication details

The article was received on 29 Jan 2017, accepted on 15 Mar 2017 and first published on 15 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00943G
Citation: J. Mater. Chem. A, 2017,5, 7494-7506
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    Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors

    A. M. Elshahawy, X. Li, H. Zhang, Y. Hu, K. H. Ho, C. Guan and J. Wang, J. Mater. Chem. A, 2017, 5, 7494
    DOI: 10.1039/C7TA00943G

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