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    • A comparative study on the charge storage performance of graphene oxide and reduced graphene oxide in different electrolytes with basic and neutral behaviour

      MEERA SATHYAN P J JANDAS HONEY JOHN

      Volume 45 Published: 2 September 2022 Article ID 0171

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0171

    • Keywords

       

      Hydrothermally reduced graphene oxide; specific capacitance; energy and power density; cyclability.

    • Abstract

       

      A comparative study on electrochemical supercapacitance performance of graphene oxide (GO) and reduced graphene oxide (rGO) was conducted in neutral and alkaline electrolytes, including Na$_2$S$_2$O$_3$ and KOH. rGO has been prepared through hydrothermal reduction of GO. Before hydrothermal reduction, GO was prepared from bulk graphite via low temperature modified Hummer’s method. The oxygen functional groups were found favourable for base-activated pseudocapacitive reactions that make GO superior to deliver improved supercapacitor performance in KOH electrolytes. On the other hand, a significant increase in effective surface area during hydrothermal reduction make rGO perform better as an electrochemical double-layer capacitor in neutral electrolyte, like sodium thiosulphate. rGO achieved an optimum specific capacitance value of 287 F g$^{–1}$ in Na$_2$S$_2$O$_3$, while GO reported 127 F g$^{–1}$ in 1 M KOH at 1 A g$^{–1}$ current density.

    • Author Affiliations

       

      MEERA SATHYAN1 P J JANDAS1 HONEY JOHN1 2

      1. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin 682022, India
      2. Inter University Centre for Nanomaterials and Devices (IUCND), Cochin University of Science and Technology, Cochin 682022, India

    • Dates

       
      Published
      2 September 2022
      Manuscript received
      8 February 2022
      Accepted
      3 May 2022
      Final version published online
      2 September 2022

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