Transformation to potential-program invariant form of voltammograms and dynamic electrochemical impedance spectra of surface confined redox species

Pajkossy, Tamás (2021) Transformation to potential-program invariant form of voltammograms and dynamic electrochemical impedance spectra of surface confined redox species. Electrochemistry Science Advances. ISSN 2698-5977

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Abstract

A theory is presented by which voltammograms, and dynamic electrochemical impedance spectroscopy (dEIS) measurements of redox processes of surface confined species can be analyzed. By the proposed procedure, from a set of voltammograms taken at varied scan-rates, two scan-rate independent, hysteresis-free functions of potential can be calculated. One of them characterizes the redox kinetics, the other is the electrode charge associated with the redox equilibrium. The theory also comprises the analysis of the impedance spectra of the same system, which have been measured during dynamic conditions, i.e. during potental scans. Because of the formal analogy, the procedure is applicable also for voltammetry and dEIS of adsorption processes.

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