Connection of CVs and impedance spectra of reversible redox systems, as used for the validation of a dynamic electrochemical impedance spectrum measurement system
Tamás Pajkossy, Gábor Mészáros
Abstract
Abstract With the purpose of fast characterization of electrode reactions, a dynamic electrochemical impedance spectrum (dEIS) measurement system has been assembled which permits the continuous collection of audio-frequency impedance spectra while performing cyclic voltammetry measurements with the usual scan rates of up to 200 mV/s. The performance of this system was tested by analyzing the CV curves and impedance spectra taken simultaneously in ferro-/ferricyanide containing aqueous solutions yielding an experimental demonstration of the connection of the semi-integrated reversible voltammograms and the Warburg coefficients.
Topics & Concepts
FerricyanideElectrical impedanceCyclic voltammetryAnalytical Chemistry (journal)Spectral lineElectrodeElectrochemistryDielectric spectroscopyRedoxMaterials scienceChemistryElectrical engineeringInorganic chemistryPhysicsPhysical chemistryEngineeringChromatographyAstronomyElectrochemical Analysis and ApplicationsAnalytical Chemistry and SensorsConducting polymers and applications