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Facile synthesis of CuO nanosheets as electrode for supercapacitor with long cyclic stability in novel methyl imidazole-based ionic liquid electrolyte

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Abstract

Hierarchical CuO nanosheets were synthesized through a facile, eco-friendly reflux deposition approach for supercapacitor electrode material for energy storage. The resultant CuO nanosheets were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption isotherm techniques. The supercapacitor behavior of CuO nanosheets was investigated by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy in novel 0.1 M aqueous 1-(1′-methyl-2′-oxo-propyl)-3-dimethylimidazolium chloride [MOPMIM][Cl] ionic liquid as an electrolyte. The result demonstrate that CuO nanosheets exhibit specific capacitance of 180 F g−1 at 10 mV s−1 scan rate which is the highest value in ionic liquid electrolyte and 87% specific capacitance retention after 5000th cycle. The electrochemical performance proves CuO nanosheets as electrode with ionic liquid electrolyte for developing green chemistry approach in supercapacitor.

As-synthesized, CuO nanosheets demonstrate excellent supercapacitor electrode performance with high specific capacitance of 180 F g−1 at 10 mV s−1 scan rate and 87% specific capacitance retention in 0.1 M aqueous [MOPMIM][Cl] IL electrolyte

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Acknowledgements

One of the authors SCB is thankful to UGC for RGN fellowship. The authors gratefully acknowledge the UGC-SAP, DST-FIST, and DST-PURSE programs at Department of Chemistry, Shivaji University, Kolhapur.

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Correspondence to Sanjay S. Kolekar.

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Bhise, S.C., Awale, D.V., Vadiyar, M.M. et al. Facile synthesis of CuO nanosheets as electrode for supercapacitor with long cyclic stability in novel methyl imidazole-based ionic liquid electrolyte. J Solid State Electrochem 21, 2585–2591 (2017). https://doi.org/10.1007/s10008-016-3490-2

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  • DOI: https://doi.org/10.1007/s10008-016-3490-2

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