Issue 47, 2009

Impedance spectra of mixed conductors: a 2D study of ceria

Abstract

In this paper we develop an analytical framework for the study of electrochemical impedance of mixed ionic and electronic conductors (MIEC). The framework is based on non-equilibrium thermodynamics and it features the coupling of electrochemical reactions, surface transport and bulk transport processes. We utilize this work to analyze two-dimensional systems relevant for fuel cell science via the finite element method (FEM). Alternate current impedance spectroscopy (AC-IS or IS) of a ceria symmetric cell is simulated near equilibrium conditions (zero bias) for a wide array of working conditions including variations of temperature and H2 partial pressure on a two-dimensional doped ceria sample with patterned metal electrodes. The model shows agreement between computed IS curves and the experimental literature where the relative error on the impedance is consistently below 2%. Important two-dimensional effects such as the impact of thickness decrease and the influence of variable electronic and ionic diffusivities on the impedance spectra are also explored.

Graphical abstract: Impedance spectra of mixed conductors: a 2D study of ceria

Article information

Article type
Paper
Submitted
17 Apr 2009
Accepted
23 Sep 2009
First published
27 Oct 2009

Phys. Chem. Chem. Phys., 2009,11, 11243-11257

Impedance spectra of mixed conductors: a 2D study of ceria

F. Ciucci, Y. Hao and D. G. Goodwin, Phys. Chem. Chem. Phys., 2009, 11, 11243 DOI: 10.1039/B907740E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements