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The effect of pH on the charge transport at redox polymer-modified electrodes: an a.c. impedance study applied to poly(o-aminophenol) film electrodes

F.J. Rodríguez Nieto - No affiliation found

1996/11/01 Full-length article DOI: 10.1016/S0022-0728(96)04704-3 Journal: Journal of Electroanalytical Chemistry

Abstract:

AbstractImpedance spectroscopy was used to study the effect of solution pH on the electrochemical behavior of poly(o-aminophenol) (POAP) modified electrodes. An a.c. impedance expression was derived on the basis of a model which considers a chemical reaction influencing the dynamics of the charge transport process by electron hopping between redox sites. Experimental impedance spectra of POAP films at different pH values of the bathing electrolyte were fitted by means of this theoretical equation. A pKa value for the proposed protonation reaction could be estimated from the model.