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Controllable MnCo2S4 Nanostructure for high performance hybrid supercapacitor

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 the wide usage as a class of the low-cost materials for energy storage. In this work, sulphospinel MnCo2S4 nanostructures have been rationally synthesised through a carefully controlled sulphorization 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 high capacitance (938 F g−1 at 20 A g−1) and excellent cycling stability being observed, where the specific capacitance could be retained 95% of its original value after 5000 charge-discharge cycles. To further demonstrate the great potential of the 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 Wh/kg at the power density of 0.801 kW/kg, and 16.2 Wh/kg can be remained at a power density of 26.5 kW/kg. Excellent cycling stability is also achieved with 87% retention after 10000 charge-discharge cycles, demonstrating a great potential for the next-generation high performance supercapacitors.

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Publication details

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


Article type: Paper
DOI: 10.1039/C7TA00943G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Controllable MnCo2S4 Nanostructure for high performance hybrid supercapacitor

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

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