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

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Abstract

Supercapacitors are attracting attention as energy storage devices but the energy density and cycle life of 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 confirmed the formation of a corn flake-like NiO nanostructure on nickel foam. The electrochemical properties of the as-prepared NiO nanostructure were analyzed by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The direct formation of a highly porous 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 strong supercapacitive behavior. The as-prepared NiO nanostructure on nickel foam exhibited a specific capacitance of 1717 F g−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. Overall, the corn flake-like NiO nanostructure on nickel foam is an excellent candidate for supercapacitor applications.

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

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C7NJ00686A

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