Abstract

Polyaniline (Pani) films were grown potentiodynamically on Pt electrodes in 0.1 M aniline/0.5 M acid (H2SO4 or HClO4), or in a 0.1 M aniline/0.5 M acid/0.2 M salt containing an alkaline cation, between -0.25 and 0.69 V vs. SCE. A series of films were grown at a sweep rate of either 0.1 V s-1 or 0.002 V s-1 only for the first cycle, followed by 0.1 V s-1 for the remaining cycles up to a constant anodic charge of 40 mC cm-2. Changes in the morphology, as well as in the electrical properties of the films as a function of the initial potential perturbation and the alkaline cation in the electrolyte were followed, respectively, by SEM images and electrochemical impedance spectroscopy measurements. © 1998 Published by Elsevier Science Ltd. All rights reserved.