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

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.

R Ramya¹ M V Sangaranarayanan¹

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

Published

January 2008