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Electrosynthesis of a corn flake-like NiO nanostructure on nickel foam for polymer gel electrolyte-based high performance asymmetric supercapacitors

Abstract

Supercapacitors are attracting attention as an energy storage device but the energy density and cycle life of the electrode materials require further improvement for commercial applications. To achieve this goal, a corn flake-like NiO nanostructure on nickel foam was synthesized using a facile electrodeposition method. X-ray diffraction, high resolution transmission electron microscopy, and field emission scanning electron microscopy revealed the formation of a corn flake-like NiO nanostructure on nickel foam. The electrochemical properties of the as-prepared NiO nanostructure were investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The direct formation of a highly electroactive area corn flake-like NiO nanostructure on nickel foam provided an excellent electronic charge transfer rate with a low equivalent series resistance and good ionic accessibility for highly supercapacitive behavior. The as-prepared NiO nanostructure on nickel foam exhibited a specific capacitance of 1717 F g-1, an energy density of 84 Wh kg-1, and a capacitance retention of 87 % after 5000 cycles. The NiO//activated carbon asymmetric supercapacitor fabricated using a polyvinyl alcohol-KOH gel electrolyte showed high energy and power densities of 44 W h kg-1 and 14 kW kg-1, respectively. This study demonstrates that the corn flake-like NiO nanostructure on nickel foam is an excellent candidate for supercapacitor applications.

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Publication details

The article was received on 27 Mar 2017, accepted on 04 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ00686A
Citation: New J. Chem., 2017, Accepted Manuscript
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    Electrosynthesis of a corn flake-like NiO nanostructure on nickel foam for polymer gel electrolyte-based high performance asymmetric supercapacitors

    V. S. Kumbhar, M. H. Cho, J. Lee, W. K. Kim, M. Lee, Y. R. Lee and J. Shim, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00686A

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