Electrochemical impedance analysis of the redox switching hysteresis of poly(3,4-ethylenedioxythiophene) films

Hass, R., Garcia Canadas, Jorge and Garcia-Belmonte, G. 2005. Electrochemical impedance analysis of the redox switching hysteresis of poly(3,4-ethylenedioxythiophene) films. Journal of Electroanalytical Chemistry 577 (1) , pp. 99-105. j.jelechem.2004.11.020

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Abstract

The effect of the redox hysteresis of poly(3,4-ethylenedioxythiophene) films on the electrochemical mechanisms analyzed by impedance has been studied. Impedance spectra were recorded at fixed steady-state potentials under both negative and positive sweeps. The effects of film thickness were also investigated by varying the polymerization charge used. It has been shown that not only do quasi-equilibrium circuit elements (low-frequency capacitance) vary with the potential sweep direction but also kinetics elements (interfacial charge transfer resistance) depend on it, both exhibiting hysteretic effects. The onset of the charge transfer resistance increase is shifted approximately −300 mV during the negative polarization.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	Electrochemical impedance; Conducting polymers; Hysteresis; PEDOT
Publisher:	Elsevier
ISSN:	1572-6657
Last Modified:	19 Mar 2016 23:21
URI:	https://orca.cardiff.ac.uk/id/eprint/48409

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