There are three redox peaks in discrete electroactive regions, a redox pair with peak potentials at 0.04 and 0.28 V and the accompanying proton elimination–addition process. Redox couples with peak potentials at 0.68 and 0.78 V were related to the redox processes of PANI in proton-deficient solutions. The redox pair with peak potentials at approximately 0.5 V was suggested to be due to the higher oxidation level of aniline. The redox peak currents increased with increasing scan rate while the peak potentials showed slight increase in positive potential.