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

Mondal, SK and Barai, Keshab and Munichandraiah, N (2007) High capacitance properties of polyaniline by electrochemical deposition on a porous carbon substrate. In: Electrochimica Acta, 52 (9). pp. 3258-3264.

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Abstract

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 $100mVs^{- 1}$ 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 $1600 \hspace{2mm} Fg^{- 1}$ are obtained and PANI coated carbon electrodes facilitate charge– discharge current densities as high as $45mA \hspace{2mm}cm^{- 2} (19.8 \hspace{2mm} Ag^{- 1})$. Electrodes are found to be fairly stable over a long cycle-life, although there is some capacitance loss during the initial stages of cycling.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Polyaniline;Polymer morphology;Specific capacitance;Potentiodynamic polymerization;Substrate effect
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 06 Jun 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ernet.in/id/eprint/11155

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