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Title: Electrochemical characterization of composite films of polypyrrole and La₁₋xSrxCoO₃ (0 ≤ x ≤ 0.4) for electrocatalysis of O₂ reduction
Authors: Singh, R N
Malviya, M
Issue Date: Dec-2007
Publisher: CSIR
Abstract: Sandwich-type composite films of polypyrrole (PPy) and La₁₋xSrxCoO₃ (0 ≤x≤0.4) on a conductive graphite support (G) have been obtained by electropolymerization for electrocatalysis of the oxygen reduction reaction (ORR). The composite films have been characterized by SEM, EDAX, cyclic voltammetry, impedance and Tafel polarization techniques. The studies show that the composite electrodes are greatly active for the ORR than the non-composite one. The higher Sr substitutions (>0.2 mol) have an adverse effect on the electrocatalytic activity. The rate for the ORR at the composite film has been found to decrease with decreasing pH of the electrolyte. Among all the four composite electrodes studied, the G/PPy/PPy(La₀․₈Sr₀․₂CoO₃)/PPy electrode in 0.5 mol dm⁻³ K₂SO₄ plus 5 m moldm⁻³ KOH at 25ºC exhibits the highest electrocatalytic activity towards the ORR.
Description: 1923-1928
ISSN: Int. Cl.⁸ B01J23/00; C25D
Appears in Collections:IJC-A Vol.46A(12) [December 2007]

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