Hierarchically Porous Nickel Oxide Nanosheets Grown on Nickel Foam Prepared by One‐Step In Situ Anodization for High‐Performance Supercapacitors |
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| Authors: | Li Yang Dr Lei Qian Xianqing Tian Dr Jing Li Dr Jianyuan Dai Prof Yong Guo Prof Dan Xiao |
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| Institution: | 1. College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064 (P.R. China), Fax: (+86)?28‐85415029;2. College of Chemical Engineering, Sichuan University, 29 Wangjiang Road, Chengdu 610064 (P.R. China) |
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| Abstract: | Porous NiO nanosheets are successfully grown on nickel foam substrate through an in situ anodization by using molten KOH as the electrolyte. High‐purity NiO is directly obtained by this one‐step method without any subsequent treatment. The obtained NiO supported on nickel foam is used as a binder‐free electrode for a supercapacitor and its pseudocapacitive behavior has been investigated by cyclic voltammetry and galvanostatic charge–discharge tests in a 6 M aqueous solution of KOH. Electrochemical data demonstrates that this binder‐free electrode possesses ultrahigh capacitance (4.74 F cm?2 at 4 mA cm?2), excellent rate capability, and cycling stability. After 1000 cycles, the areal capacitance value is 9.4 % lower than the initial value and maintains 85.4 % of the maximum capacitance value. |
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| Keywords: | anodization electrochemistry nanostructures nickel supercapacitors |
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