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Issue 17, 2018
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Facile synthesis of hierarchical porous manganese nickel cobalt sulfide nanotube arrays with enhanced electrochemical performance for ultrahigh energy density fiber-shaped asymmetric supercapacitors

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Abstract

To create high energy density fiber-shaped supercapacitors (FSCs), a new class of hierarchical electrodes with high electrical conductivity and good mechanical stability is needed. Here, a novel electrode consisting of porous manganese–nickel–cobalt sulfide (MNCS) multi-tripod nanotube arrays (NTAs) on carbon nanotube fibers (CNTFs) is prepared by a facile and cost-effective synthesis. The MNCS NTAs/CNTF electrode achieves a high specific capacitance of 2554.5 F cm−3, which is attributed to the high electrical conductivity and richer redox reactions of MNCS NTAs resulting from mixing three metal elements followed by sulfidation, and high porosity but a robust architecture. The unique features of these electrodes allowed us to successfully fabricate a fiber-shaped asymmetric supercapacitor (FASC) with a maximum operating voltage of 1.6 V by using the vanadium nitride (VN) nanowires (NWs) on CNTF electrode as the negative electrode. A volumetric capacitance of 147.3 F cm−3 and an energy density of 52.4 mW h cm−3 of the as-obtained FASC device are higher than those reported for similar devices. In addition, our FASC device possesses outstanding reliability and achieves a retaining capacitance of 92.9% after 5000 bending cycles. Thus, this work develops hierarchical, porous MNCS multi-tripod NTAs as a promising candidate for next-generation electrode materials with high electrochemical performance.

Graphical abstract: Facile synthesis of hierarchical porous manganese nickel cobalt sulfide nanotube arrays with enhanced electrochemical performance for ultrahigh energy density fiber-shaped asymmetric supercapacitors

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Publication details

The article was received on 10 Feb 2018, accepted on 22 Mar 2018 and first published on 22 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA01440J
Citation: J. Mater. Chem. A, 2018,6, 8030-8038
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    Facile synthesis of hierarchical porous manganese nickel cobalt sulfide nanotube arrays with enhanced electrochemical performance for ultrahigh energy density fiber-shaped asymmetric supercapacitors

    X. Wang, Q. Zhang, J. Sun, Z. Zhou, Q. Li, B. He, J. Zhao, W. Lu, C. Wong and Y. Yao, J. Mater. Chem. A, 2018, 6, 8030
    DOI: 10.1039/C8TA01440J

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