Journal
ELECTROCHIMICA ACTA
Volume 271, Issue -, Pages 507-518Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.03.183
Keywords
Ni3S2; Nanorod; Graphene; Symmetric supercapacitor
Categories
Funding
- Research Grants Council [61212814, 16208718]
- Innovation and Technology Commission of the Hong Kong SAR [ITS/318/14, ITS/001/17]
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We report the synthesis of mesoporous Ni3S2 nanorod arrays on three-dimensional Ni-graphene foams by a facile hydrothermal method for ultrahigh performance supercapacitors. The graphene foam facilitates unique morphological evolution during the hydrothermal process, from a mesoporous, monolithic structure to nanorod arrays of Ni3S2 with a hollow core-solid shell structure and to entirely solid nanorod arrays of Ni3S2. The Ni3S2 composite electrode delivers a remarkable specific capacitance of 1900 F g(-1) at a current density of 1 A g(-1), as well as promising cyclic stability with a high capacitance of 940 F g(-1) after 2000 cycles at 10 A g(-1) and 96% retention of its initial capacitance after the 2001st cycle at 5 A g(-1). The symmetric supercapacitor prepared using the Ni3S2 electrodes under an optimum condition operates in a wide potential window of 0-1.6 V and offers a specific capacitance of 190.5 F g(-1) at 4.5 mA cm(-2) along with a maximum energy density of 67.7Wh kg(-1). The promising electrochemical performance along with the facile synthesis strategy offers a new insight into developing high performance supercapacitors for emerging energy storage applications. (C) 2018 Elsevier Ltd. All rights reserved.
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