Abstract
NiO nanosheets were deposited on the surface of a stainless steel substrate by using a facile, environmentally friendly, reflux deposition approach for supercapacitor (SC) applications. X-ray diffraction patterns and field emission scanning electron microscopy images revealed the formation of a face centred cubic crystal structure with a uniform, compact, smoothly ordered nanosheet like structure. This study focuses on the electrochemical supercapacitive properties of NiO nanosheets with respect to cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques in a 1-(\(2^{\prime }{,}3^{\prime }\)-dihydroxypropyl)-3-methylimidazolium hydroxide [DHPMIM][OH] ionic liquid (IL) as an electrolyte. The electrochemical study revealed that NiO (0.3 M) showed a high-specific capacitance of \(\hbox {205.5 F g}^{-1}\) and an excellent cycling stability (80% specific capacitance retention after 5000 cycles) in the [DHPMIM][OH] IL electrolyte. Thus, the result showed that NiO nanosheets act as an active electrode material hold for SCs.
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Acknowledgements
One of the authors SCB is thankful to UGC for RGN fellowship. This work is partially supported by the Brain Pool Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (NRF-2018H1D3A2002154) and a Human Resources Development Grant (No. 20164030201310) from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korean Government Ministry of Trade, Industry and Energy.
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Bhise, S.C., Awale, D.V., Vadiyar, M.M. et al. A mesoporous nickel oxide nanosheet as an electrode material for supercapacitor application using the 1-(\(2^{\prime }\),\(3^{\prime }\)-dihydroxypropyl)-3-methylimidazolium hydroxide ionic liquid electrolyte. Bull Mater Sci 42, 263 (2019). https://doi.org/10.1007/s12034-019-1961-7
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DOI: https://doi.org/10.1007/s12034-019-1961-7