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|Title:||Electrochemical characterization of polypyrrole/cobalt ferrite composite films for oxygen reduction|
Singh, J P
Singh, R N
|IPC Code:||Int. CI. 7 B01123174: C25D; GOIR|
|Abstract:||Electrodeposited films of polypyrrole (PPy) and composite of PPy and CoFe2O4 nanoparticles, incorporated with a charge compensating electrolyte anion (CIO4-) have been obtained on polished and pretreated graph ite electrodes a n~ characterized by cyclic voltammetry, impedance and cathodic polarization techniques. The study of films in a 0.8 mol dm-3 LiCiO4 + 5 mmol dm-3 KOH solution indicates that the porosi ty of the polymer matrix somewhat increases with incorporation of oxide nano-particles. The average apparent diffusion coefficient (Da) of the dopant (CIO4-) has been observed to be -2 times higher in the composite film compared to pure PPy film. The sum of the film and solution resistances. though higher for the composite electrode, remains practically constant under cathodic polarization conditions. In contrast to a non-composite electrode of the same oxide, the composite electrode exhibits much better electrocatalytic activity towards the O2 reduction reaction.|
|Appears in Collections:|| IJC-A Vol.44A(11) [November 2005]|
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