The rate-determining step in electrochemical impedance spectroscopy

Date

2015

Authors

Harrington, David A.

Journal Title

Journal ISSN

Volume Title

Publisher

Journal of Electroanalytical Chemistry

Abstract

The concept of the rate-determining step (rds) is applied to electrochemical impedance spectroscopy (EIS). For consecutive (sequential) reaction steps with adsorption and fast mass transport, if the rds is preceded by rapid preequilibria and followed by fast steps then the EIS spectrum reduces to a single semicircle in the complex plane. The diameter of this semicircle is the polarization resistance and is related to the kinetics of the rds. The capacitance associated with this semicircle is the sum of the double-layer capacitance and a pseudocapacitance associated with the coverages of species in the preequilibria.

Description

Keywords

Rate-determining step, EIS, Impedance, Adsorption

Citation

Harrington, D.A. (2015). The rate-determining step in electrochemical impedance spectroscopy. Journal of Electroanalytical Chemistry, 737, 30-36. https://doi.org/10.1016/j.jelechem.2014.06.003