Effect of prolonged electrode potential cycling on the conduction properties of poly(o-aminophenol) film electrodes

R. TUCCERI .

SOP Transactions on Physical Chemistry

Scientific oline publishing

Lugar: California; Año: 2014 vol. 1 p. 1 - 9

2372-6156

The aim of this work was to study the effect of prolonged potentiodynamic cycling (PPC) on the conducting properties of poly(oaminophenol)(POAP) film electrodes. PPC reduces strongly the electron transport rate at POAP films. This effect is called hereindeactivation. Cyclic Voltammetry (CV), Rotating Disc Electrode Voltammetry (RDEV) and Electrochemical Impedance Spectroscopy(EIS) were employed in this study. The attenuation of the voltammetric response of the polymer with the increase in the number ofoxidation-reduction cycles allowed one to define a degree of deactivation. RDEV and EIS were employed to obtain the dependenceof some charge-transport parameters on the degree of deactivation of the polymer. RDEV data were interpreted in terms of theelectron hopping model. Impedance spectra were analysed on the basis of a model which considers a protonation reaction coupledwith a self-exchange process between oxidized and reduced sites. POAP films maintain their conducting properties almost unalteredfor about 500 potential cycles at a scan rate of 0.010 Vs􀀀1. However, a loss of conductivity was observed as the number of potentialcycles was extended beyond 500.