Issue 21, 2024

Transmission line revisited – the impedance of mixed ionic and electronic conductors

Abstract

This contribution provides a comprehensive guide for evaluating the one-dimensional impedance response of dense mixed ionic and electronic conductors based on a physically derived transmission line model. While mass and charge transport through the bulk of a mixed conductor is always described by three fundamental parameters (chemical capacitance, ionic conductivity and electronic conductivity), it is the nature of the contact interfaces that largely determines the observed impedance response. Thus, to allow an intuitive adaptation of the transmission line model for any specific measurement situation, the physical meanings of terminal impedance elements at the ionic and electronic rail ends are explicitly discussed. By distinguishing between charge transfer terminals and electrochemical reaction terminals, the range of possible measurement configurations is categorized into symmetrical, SOFC-type and battery-type setups, all of which are explored on the basis of practical examples from the literature. Also, the transformation of an SOFC electrode into a battery electrode and the relevance of side reactions for the impedance of battery electrodes is discussed.

Graphical abstract: Transmission line revisited – the impedance of mixed ionic and electronic conductors

Supplementary files

Article information

Article type
Tutorial Review
Submitted
05 Mar 2024
Accepted
08 May 2024
First published
08 May 2024
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2024,26, 15068-15089

Transmission line revisited – the impedance of mixed ionic and electronic conductors

A. E. Bumberger, A. Nenning and J. Fleig, Phys. Chem. Chem. Phys., 2024, 26, 15068 DOI: 10.1039/D4CP00975D

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