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Effect of electrolyte concentration on the electrochemical performance of RGO–KOH supercapacitor

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Abstract

The electrolyte used, plays a crucial role in the electrochemical performance of supercapacitors. It is known that the concentration of electrolyte is also a controlling parameter for a given active material where the performance will be optimum for a particular concentration. Herein, we report a study on the effect of electrolyte concentration on the electrochemical performance of reduced graphite oxide–potassium hydroxide supercapacitor. The supercapacitor achieves a maximum specific capacitance of 232 F g−1 in 6 M KOH with energy and power density values of ~21 Wh kg−1 and ~400 W kg−1, respectively. The kinetics of charge storage reveals that the combination of surface phenomenon and intercalation process leads to maximum specific capacitance.

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Acknowledgements

PK acknowledges University of Kerala, India, for financial assistance in the form of Research Fellowship. V B acknowledges University of Kerala, India, for funding under the project ‘Setting up of 2D Materials Lab’ and Kerala State Council for Science Technology and Environment, Government of Kerala, India, for financial support under SARD program (Grant No. KSCSTE SARD/003/2016). Authors are thankful to Central Laboratory for Instrumentation and Facilitation (CLIF), University of Kerala, for XRD and XPS measurements and Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology, Mumbai, India, for HRTEM and CHNSO analyses.

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Authors and Affiliations

  1. Department of Physics, University of Kerala, Karyavattom, Thiruvananthapuram, 695 581, India

    Pinku Krishnan & V Biju

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  1. Pinku Krishnan
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  2. V Biju
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Correspondence to V Biju.

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Krishnan, P., Biju, V. Effect of electrolyte concentration on the electrochemical performance of RGO–KOH supercapacitor. Bull Mater Sci 44, 288 (2021). https://doi.org/10.1007/s12034-021-02576-2

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  • DOI: https://doi.org/10.1007/s12034-021-02576-2

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