Voltammetric Formation of Polyaniline on Gold and Platinum under Static and Forced Convection Conditions

Abstract

The present research work studied the formation of conducting polyaniline (PANI) films in acid media. Cyclic voltammetry, under static and forced convection conditions were used for the polymer electrodeposition onto different working electrodes: gold and platinum. It was observed that during the first voltammetric cycle, under static conditions, the aniline oxidation potential is independent of the substrate; although after the first cycle, it was observed that PANI than oxidation process occurs at a smaller potential on the gold electrode, compared to that taking place on platinum, which suggests that different aniline oligomeric species had been deposited on the electrodes surfaces. So far, the results obtained under forced convection conditions indicate a current density increment associated to the first oxidation branch, although subsequently, as the rotation rate increased the polyaniline growth did not occur.