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One-pot Synthesis of Self-Supported Hierarchical Urchin-like Ni3S2 with Ultrahigh Areal Pseudocapacitance

Abstract

Recently, nickel sulfides have been widely investigated as the electrode material for pseudocapacitors. Among them, self-supported nickel sulfides have been intensively studied, yet, their structures are rather limited to nanosheet or nanorod arrays. Herein, a facile one-step hydrothermal method was developed to synthesize self-supported Ni3S2 on Ni foam substrate with an urchin-like hierarchical structure consisting of nanowire subunits with a diameter of about 30 nm, thus harvesting the advantages of both hierarchical and self-supported constructions. Because of this unique structure, when the sample was applied as an electrode for supercapacitor, it demonstrated an ultrahigh areal capacitance of 21.54 F cm2 at a current rate of 2 mA cm-2, and even at a very high current rate of 50 mA cm-2, a reversible capacitance of 5.40 F cm-2 can still be retained after 1000 charge-discharge cycles. When the sample was employed to build an asymmetric supercapacitor (ASC) as the cathode with activated carbon as the anode, the device exhibited an areal capacitance of 1.26 F cm-2 at a current rate of 2 mA cm-2 and a Coulombic efficiency of 97.7%. Furthermore, this device showed great potential for practical application by lighting up 8 red light-emitting diodes.

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Publication details

The article was received on 30 May 2018, accepted on 10 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05050C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    One-pot Synthesis of Self-Supported Hierarchical Urchin-like Ni3S2 with Ultrahigh Areal Pseudocapacitance

    Q. He, Y. Wang, X. Liu, D. J. Blackwood and J. S. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05050C

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