Generator-Sensor Impedance at Double Channel Electrodes

Date

2017

Authors

Holm, Thomas
Ingdal, Mats
Strobl, Johnathan R.
Fanavoll, Espen V.
Sunde, Svein
Seland, Frode
Harrington, David A.

Journal Title

Journal ISSN

Volume Title

Publisher

Electrochimica Acta

Abstract

A method for measuring downstream concentration effects through electrochemical impedance spectroscopy at double channel electrodes is demonstrated. An ac current perturbation is applied at an upstream working electrode and the resulting ac potential response at a downstream sensing electrode is measured. This generator-detector scheme is implemented with a single potentiostat. Experimental data for a reversible redox couple are presented and good agreement is found with numerical simulations. A qualitative explanation of the features is given which lays the foundation for a more rigorous theoretical treatment. Relationships with flow rate and frequency are found that can scale the data to lie on a universal curve.

Description

Keywords

Channel electrode, Electrochemical impedance spectroscopy, Mass transport, FEM

Citation

Holm, T., Ingdal, M., Strobl, J.R., Fanavoll, E.V., Sunde, S., Seland, F. & Harrington, D.A. (2017). Generator-Sensor Impedance at Double Channel Electrodes. Electrochimica Acta, 229, 452-457. https://doi.org/10.1016/j.electacta.2017.01.075