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    • Analysis of polypyrrole-coated stainless steel electrodes - Estimation of specific capacitances and construction of equivalent circuits

      R Ramya M V Sangaranarayanan

      Volume 120 Issue 1 January 2008 pp 25-31

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/120/01/0025-0031

    • Keywords

       

      Polypyrrole; equivalent circuit; impedance spectroscopy; specific capacitance; charge-discharge; supercapacitors.

    • Abstract

       

      The galvanostatic polymerization of pyrrole is carried out on stainless steel electrodes using 𝑝-toluene sulphonic acid. The morphology of the film is studied from Scanning Electron Microscopy (SEM) measurements while the nature of the substrate is analysed using Energy Dispersive X-ray Spectroscopy (EDAX) technique. The electrochemical behaviour is studied using cyclic voltammetry, charge-discharge analysis and impedance spectroscopy. The feasibility of the electrode for supercapacitor applications is investigated. The specific capacitance is estimated as ∼ 102 Farads per gram with 103 charge-discharge cycles. A plausible equivalent circuit for the system is proposed and the circuit parameters are obtained by non-linear regression analysis.

    • Author Affiliations

       

      R Ramya1 M V Sangaranarayanan1

      1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036

    • Dates

       
      Published
      January 2008

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