High capacitance properties of polyaniline by electrochemical deposition on a porous carbon substrate

Electrochemical deposition of polyaniline (PANI) is carried out on a porous carbon substrate for supercapacitor studies. The effect of substrate is studied by comparing the results obtained using platinum, stainless steel and porous carbon substrates. PANI deposited at 100 mV s −1 sweep rate by pote...

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Bibliographic Details
Published in:Electrochimica acta 2007-02, Vol.52 (9), p.3258-3264
Main Authors: Mondal, S.K., Barai, Keshab, Munichandraiah, N.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors. Resistors. Filters
Electrical engineering. Electrical power engineering
Exact sciences and technology
Polyaniline
Polymer morphology
Potentiodynamic polymerization
Specific capacitance
Substrate effect
Various equipment and components
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Summary:Electrochemical deposition of polyaniline (PANI) is carried out on a porous carbon substrate for supercapacitor studies. The effect of substrate is studied by comparing the results obtained using platinum, stainless steel and porous carbon substrates. PANI deposited at 100 mV s −1 sweep rate by potentiodynamic technique on porous carbon substrate is found to possess superior capacitance properties. Experimental variables, namely, concentrations of aniline monomer and H 2SO 4 supporting electrolyte are varied and arrived at the optimum concentrations to obtain a maximum capacitance of PANI. Low concentrations of both aniline and H 2SO 4, which produce PANI at low rates, are desirable. The PANI deposits prepared under these conditions possess network morphology of nanofibrils. Capacitance values as high as 1600 F g −1 are obtained and PANI coated carbon electrodes facilitate charge–discharge current densities as high as 45 mA cm −2 (19.8 A g −1). Electrodes are found to be fairly stable over a long cycle-life, although there is some capacitance loss during the initial stages of cycling.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2006.09.067