Electropolymerization and characterization of COOH-functionalized poly(3,4-ethylenedioxythiophene): Ionic exchanges

Journal ar
Electrochimica Acta
  • Volumen: 56
  • Número: 27
  • Fecha: 30 noviembre 2011
  • Páginas: 10238-10245
  • ISSN: 00134686
  • Tipo de fuente: Revista
  • DOI: 10.1016/j.electacta.2011.09.020
  • Tipo de documento: Artículo
The electropolymerization of COOH-functionalized 3,4-ethylenedioxythipohene was investigated by cyclic voltammetry, by anodic potential steps or by flow of a constant anodic current. Compared with PEDOT, an anodic shift of the oxidation polymerization potential is observed. Nevertheless the polymer film oxidation/reduction is shifted to more cathodic potentials, giving higher stored specific charges than those obtained from PEDOT films generated in similar conditions. The generated polymer shows a stable redox process, E0 = -0.04 V. EQCM results point to a p-doping process exchanging anions with solution, whereas a second reduction process at -0.77 V is related to a p-doping process exchanging cations. The new material is electrochromic: it is colourless in its oxidized state and blue colour in its reduced state. UV-Vis spectroelectrochemical results are similar to those obtained from PEDOT films. © 2011 Elsevier Ltd. All Rights Reserved.

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