The redox switching of poly(3,4-ethylenedioxythiophene) (PEDOT) electrodeposited on a platinum electrode surface was analysed during cyclic voltammetry experiments in propylene carbonate solution. The effects of the holding potential E,, and the waiting time t(w) were studied during the oxidation. For a fixed value of E-w, an increase of the anodic peak current and the peak potential as a function of t(w) was observed. On the other hand, for a fixed value of t(w) a linear relationship between the anodic peak potential and E-w was found. In order to quantify the electro-mechanical stress during the waiting time, an anodic over-tension in relation to the conformational relaxation was determined. Finally, a dimensionless parameter was introduced to characterize the interdependence of the anodic peak current and the plateau current. (C) 2003 Elsevier Science B.V. All rights reserved.