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Hierarchical nickel nanowire@NiCo2S4 nanowhiskers composite arrays with test-tube-brush-like structure for high-performance supercapacitors

Abstract

Well-ordered, hierarchical and nanostructured composite electrodes have gained tremendous research attentions for energy storage applications, because of their highly efficient electron and ion transport channels and abundant electrochemically active sites. However, scalable preparation of such architectures with high active material mass loadings for making better use of the whole electrode area remains a great challenge. Herein, needle-like NiCo2S4 nanowhiskers are radially grown on a uniform nickel nanowire array (NNA), forming a unique densely-packed test-tube-brush-like nanostructure. Since these NiCo2S4 nanowhiskers are intrinsically highly electrically conductive, the hierarchical electrode structure can drastically elevate the charge transport ability in the whole electrode region; additionally, it can greatly help to release stresses at micro- and nano-scales, leading to robust mechanical flexibility and superior energy storage capability. Experimental results show that this composite array electrode exhibits an ultrahigh specific capacitance of 1,523 F g-1 at a mass loading of 4.03 mg cm-2 at the current density of 1 A g-1, and a rate capability of 61.8% from 1 to 40 A g-1, together with a superior cycle stability of 92.4% of capacitance retention after 20,000 cycles at a current density as high as 10 A g-1. An asymmetric supercapacitor consisting of NNA@NiCo2S4 (NNANCS) cathode and activated carbon (AC) anode delivers a maximum energy density of 47.29 W h kg-1 at the power density of 793.5 W kg-1 and still an energy density of 29.50 W h kg-1 at a maximum power density of 27.64 kW kg-1. This work may inspire new ideas of constructing high-performace electrodes for energy storage.

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Publication details

The article was received on 21 May 2018, accepted on 11 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04727H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hierarchical nickel nanowire@NiCo2S4 nanowhiskers composite arrays with test-tube-brush-like structure for high-performance supercapacitors

    J. Liao, P. Zou, S. Su, A. Nairan, Y. Wang, D. Wu, C. P. Wong, F. Kang and C. Yang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04727H

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