Kinetics of electron transfer between Fe(CN)(6)(3-/4-) and poly(3,4-ethylenedioxythiophene) studied by electrochemical impedance spectroscopy

F. Sundfors, Johan Bobacka, Ari Ivaska, Andrzej Lewenstam

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu

80 Sitaatiot (Scopus)

Abstrakti

The electron transfer between the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and the Fe(CN)(6)(3-/4-) redox couple in aqueous solution was investigated by electrochemical impedance spectroscopy (EIS). PEDOT was electrochemically deposited on platinum from aqueous solutions containing 0.01 M 3,4-ethylenedioxythiophene (EDOT) and 0.1 M poly(sodium 4-styrenesulfonate) (NaPSS) as supporting electrolyte. Pt/PEDOT(PSS) electrodes with polymer films of different thickness were investigated at different concentrations of the redox couple in 0.1 M KCl background electrolyte solution. Impedance spectra were obtained at the dc-potential corresponding to the formal redox potential of Fe(CN)(6)(3-/4-) (E-2 approximate to 220 mV) where the polymer is in the oxidized and electrically conducting state. The EIS data for the electrodes were fitted to an equivalent electrical circuit. The standard rate constant (k(o)) for electron-transfer between Pt/PEDOT(PSS) and Fe(CN)(6)(3-/4-) was determined by calculations based on the Butler-Volmer equation. The diffusion coefficient (D) of the redox couple was also calculated from the EIS data. (C) 2002 Elsevier Science Ltd. All rights reserved.
AlkuperäiskieliEi tiedossa
OtsikkoElectrochimica Acta
KustantajaElsevier
Sivut2245–2251
Sivumäärä7
TilaJulkaistu - 2002
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Symposium on Electrochemical Impedance Spectroscopy - Fifth International Symposium on Electrochemical Impedance Spectroscopy
Kesto: 17 kesäkuuta 200122 kesäkuuta 2001

Konferenssi

KonferenssiInternational Symposium on Electrochemical Impedance Spectroscopy
Ajanjakso17/06/0122/06/01

Keywords

  • electron transfer
  • equivalent circuit

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