The Overoxidation of poly(3-hexylthiophene) (P3HT) Thin Film: CV and EIS measurements

Abstract: In this study the electrochemical degradation of electropolymerized poly (3-hexylthiophene) (P3HT) thin film electrode was carried out by mild overoxidation conditions. Cyclic voltammetry (CV) showed the material electrochemical response lost by change in the intensity and position of the oxidation/reduction peak. Electrochemical impedance spectroscopy (EIS) showed an increase in the charge-transfer resistance (R-ct) and a decrease of the low-frequency capacitance related to the load of the intercalated charge in the polymeric film. Such behavior was assigned to a hindering in the ionic intercalation/deintercalation process across the polymer/ electrolyte interface, which was also corroborated by the dielectric relaxation time (t(0)) analysis.

Author(s): Goncalves, R; Pereira, EC; Marchesi, LF

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE

DOI: 10.20964/2017.03.44