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Issue 26, 2018
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P-Doped NiCo2S4 nanotubes as battery-type electrodes for high-performance asymmetric supercapacitors

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Abstract

NiCo2S4 is a promising electrode material for supercapacitors, due to its rich redox reactions and intrinsically high conductivity. Unfortunately, in most cases, NiCo2S4-based electrodes often suffer from low specific capacitance, low rate capability and fast capacitance fading. Herein, we have rationally designed P-doped NiCo2S4 nanotube arrays to improve the electrochemical performance through a phosphidation reaction. Characterization results demonstrate that the P element is successfully doped into NiCo2S4 nanotube arrays. Electrochemical results demonstrate that P-doped NiCo2S4 nanotube arrays exhibit better electrochemical performance than pristine NiCo2S4, e.g. higher specific capacitance (8.03 F cm−2 at 2 mA cm−2), good cycling stability (87.5% capacitance retention after 5000 cycles), and lower charge transfer resistance. More importantly, we also assemble an asymmetric supercapacitor using P-doped NiCo2S4 nanotube arrays and activated carbon on carbon cloth, which delivers a maximum energy density of 42.1 W h kg−1 at a power density of 750 W kg−1. These results demonstrate that the as-fabricated P-doped NiCo2S4 nanotube arrays on carbon cloth show great potential as a battery-type electrode for high-performance supercapacitors.

Graphical abstract: P-Doped NiCo2S4 nanotubes as battery-type electrodes for high-performance asymmetric supercapacitors

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Publication details

The article was received on 28 Apr 2018, accepted on 02 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01689E
Citation: Dalton Trans., 2018,47, 8771-8778
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    P-Doped NiCo2S4 nanotubes as battery-type electrodes for high-performance asymmetric supercapacitors

    J. Lin, Y. Wang, X. Zheng, H. Liang, H. Jia, J. Qi, J. Cao, J. Tu, W. Fei and J. Feng, Dalton Trans., 2018, 47, 8771
    DOI: 10.1039/C8DT01689E

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