Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 9, Issue 6, Pages 1579-1585Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201402175
Keywords
anodization; electrochemistry; nanostructures; nickel; supercapacitors
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Funding
- National Natural Science Foundation of China [21177090, 21275104, 21075083]
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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 6M aqueous solution of KOH. Electrochemical data demonstrates that this binder-free electrode possesses ultrahigh capacitance (4.74Fcm(-2) at 4mAcm(-2)), excellent rate capability, and cycling stability. After 1000cycles, 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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