PEDOT/Nafion composite thin films supported on Pt electrodes: Facile fabrication and electrochemical activities

Poly-3,4-ethylenedioxythiophene(PEDOT)/Nafion composite thin films were prepared by a facile electrochemical polymerization approach. These films were characterized by wavelength dispersive spectroscopy (WDS), scanning electron microscopy (SEM), atomic/electric force microscopy (AFM/EFM), cyclic voltammetry (CV), potential step chronoamperometry (PSC), and electrochemical impedance spectroscopy (EIS). The as-prepared film was dense and smooth and had nearly uniform PEDOT and Nafion distribution on the nanometer scale with slight localized phase segregation. Electrochemical experiments revealed a PEDOT/Nafion stable potential window and a PEDOT/Nafion overoxidation potential window. Hole mobility in the film was quantified by PSC technique and charge transport theory, and was verified independently by EIS technique. (C) 2010 Elsevier B.V. All rights reserved.