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한국전기화학회 한국전기화학회

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Vol.25, No.1, February 2022

Analysis of Electrochemical Performance of Reduced Graphene Oxide based Symmetric Supercapacitor with different Aqueous Electrolytes
JKES Vol.25, No.1, pp.22-31, February 2022
DOI : 10.5229/JKES.2022.25.1.22
Sneha Ravi, Shivangi Kosta, Kuldeep Rana*
Electrical Appliances Technology Division, Central Power Research Institute, Bengaluru, India-560080
C. A. E-mail : kuldeeprana@cpri.in

Carbon nanomaterials are considered to be the materials of choice for the fabrication of electrochemical energy storage devices due to their stability, cost-effectiveness, well-established processing techniques, and superior performance compared to other active materials. In the present work, reduced graphene oxide (rGO) has been synthesized and used for the fabrication of a symmetric supercapacitor. The electrochemical performance of the fabricated supercapacitors with three different aqueous electrolytes namely 0.5 M H2SO4, 0.5 M H3PO4, and 1.0 M Na2SO4 have been compared and analyzed. Among the three electrolytes, the highest areal specific capacitance of 14 mF/cm2 was calculated at a scan rate of 5 mV/s observed with 0.5 M H3PO4 electrolyte. The results were also confirmed from the charge/discharge results where the supercapacitor with 0.5 M H3PO4 electrolyte delivered a specific capacitance of 11 mF/cm2 at a current density of  0.16 mA/cm2. In order to assess the stability of the supercapacitor with different electrolytes, the cells were subjected to continuous charge/discharge cycling and it was observed that acidic electrolytes showed excellent cyclic stability with no appreciable drop in specific capacitance as compared to the neutral electrolyte.

Keyword : Aqueous Electrolyte, Energy Storage, Reduced graphene oxide (rGO), Supercapacitors

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