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Bimetallic vanadium cobalt diselenides nanosheets with additional active sites for excellent asymmetric pseudocapacitive performance: Compare the electrochemical performances with M-CoSe2 (M = Zn, Mn, and Cu)

Abstract

Recently, the bimetallic selenides have been considered as the efficient electrocatalysts towards various electrochemical applications. Here, we demonstrated the synthesis of different transition metals (M = V, Zn, Mn, and Cu) incorporated CoSe2 (M-CoSe2). The resultant enhancement and modification in pseudocapacitive behaviour of M-CoSe2 were achieved due to the multiple redox property and intrinsic electronic conductivity. Among them, bimetallic V-CoSe2 deposited nickel foam (V-CoSe2/NF) exhibited the substantial specific surface area, higher specific capacitance (1830.2 F/g at 1.5 A/g), long-term cycling stability (118% retention, 5000 cycles) and lower internal charge transfer resistance (Rct = 36.74 Ω). Thus, the asymmetric device assembled with V-CoSe2 and activated carbon (AC) exhibited an excellent energy density of 103.03 W h kg-1 at a power density of 1200 W kg-1. Finally, this work gives a new idea to develop the defect-rich transition metal selenides for high energy density supercapacitor device.

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Publication details

The article was received on 20 Mar 2019, accepted on 12 Apr 2019 and first published on 12 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA03024G
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Bimetallic vanadium cobalt diselenides nanosheets with additional active sites for excellent asymmetric pseudocapacitive performance: Compare the electrochemical performances with M-CoSe2 (M = Zn, Mn, and Cu)

    M. Sakthivel, R. Sukanya, S. M. Chen and K. Ho, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03024G

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