Monitoring of the electrochemical degradation of PEDOT films on gold using the bending beam method

Mária Ujvári, Mihály Takács, Soma Vesztergom, Fanni Bazsó, Ferenc Ujhelyi, Gyozo G. Láng

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Electrochemical and mechanical properties of thin poly(3,4- ethylenedioxythiophene) films deposited on gold have been investigated in aqueous sulfuric acid and sodium-sulfate solutions. It has been shown that at sufficiently positive electrode potentials, overoxidation of the polymer takes place. In some cases, only small changes could be observed in the shape of cyclic voltammograms taken in the "stability region" before and after overoxidation. In contrast to this, the impedance spectra recorded after overoxidation differed considerably from the impedance spectra of a freshly made electrode. Morphological changes of the polymer caused by overoxidation (degradation) could be detected by using the bending beam method.

Original languageEnglish
Pages (from-to)2341-2349
Number of pages9
JournalJournal of Solid State Electrochemistry
Volume15
Issue number11-12
DOIs
Publication statusPublished - Dec 1 2011

Keywords

  • Bending beam method
  • Impedance
  • PEDOT. Degradation
  • Stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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