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Surfactant-Dependent Flower and Grass Like Zn0.76Co0.24S/Co3S4 for High-Performance All-Solid-State Asymmetric Supercapacitors

Abstract

Establishing a class of electrode materials with an excellent electrochemical performance by a simple method for supercapacitors is urgent. Composite electrode materials, Zn0.76Co0.24S/Co3S4, with different morphologies on three dimensional nickel foam were firstly fabricated using a facile hydrothermal method and succeeding anion exchange technique. Different surfactants, ammonium fluoride (NH4F) or poly-vinylpyrrolidone (PVP), contribute to develop various morphologies with hexamethylenetetramine (HMT) serving as the alkaline source. The mechanisms of the surfactants were analyzed by adjusting the ratios of surfactants. The NH4F actuated flower like Zn0.76Co0.24S/Co3S4 expresses a superior specific capacitance of 2798.16 F g-1 at 5 mA cm-2 and retains outstanding cyclic stability of 93.8% after 7000 cycles, which is better than the grass like Zn0.76Co0.24S/Co3S4 actuated by PVP. The fabricated all-solid-state asymmetric supercapacitor (ASC), flower like Zn0.76Co0.24S/Co3S4//RGO, expresses a high energy density of about 62.22 Wh kg-1 and a maximum power density of 16 kW kg-1, and long cycle life (retaining 86.3% after 8000 cycles). The easily fabricated transition metal sulfides composite provide a way to generate more excellent electrode materials for energy storage devices

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Publication details

The article was received on 23 Aug 2018, accepted on 11 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08212J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Surfactant-Dependent Flower and Grass Like Zn0.76Co0.24S/Co3S4 for High-Performance All-Solid-State Asymmetric Supercapacitors

    Y. yang, W. Huang, S. Li, L. Ci and P. Si, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08212J

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