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Superior cycling stability of crystalline/amorphous Co3S4 core-shell heterostructure for aqueous asymmetric supercapacitors

Abstract

In this article, a novel crystalline/amorphous Co3S4 core-shell heterostructure supported on nickel foam is fabricated through a facile method. Due to the unique structure of crystalline Co3S4 cores that provides stable mechanical support and surface-active sites, while amorphous shells facilitate diffusion and reaction of electrolyte ions, the obtained crystalline/amorphous Co3S4 electrode shows superior pseudocapacitive performance of 2.65 F cm-2 (2038.5 F g-1) at current density of 5 mA cm-2 and even 1.81 F cm-2 (1392.3 F g-1) at 50 mA cm-2. In addition, the Co3S4//AC exhibits a relatively high energy density of 54.78 Wh kg-1 at power density of 400.02 W kg-1 and excellent cycling performance (about 94.8% capacitance retention over 32500 cycles). The kinetic analysis reveals a diffusion controlled faradaic characteristic of Ni3S4 (73.21% diffusion-controlled contribution). Moreover, the fabrication process presented in this work is facile, cost-effective, and environmentally benign, offering a feasible solution for fabricating next-generation high-performance energy storage devices.

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Publication details

The article was received on 21 Aug 2018, accepted on 02 Oct 2018 and first published on 06 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08135B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Superior cycling stability of crystalline/amorphous Co3S4 core-shell heterostructure for aqueous asymmetric supercapacitors

    M. Liang, M. Zhao, H. Wang, Q. Zheng and X. Song, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08135B

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