Impedance spectra of mixed conductors: a 2D study of ceria
- Creators
- Ciucci, Francesco
- Hao, Yong
- Goodwin, David G.
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 H_2 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.
Additional Information
© Royal Society of Chemistry 2009. Received 17th April 2009, accepted 23rd September 2009. First published as an Advance Article on the web 27th October 2009. The authors gratefully acknowledge financial support for this work by the Office of Naval Research under grant N00014-05-1-0712. The authors also thank Prof. Frederic Hecht for his valuable insight and support on FreeFem++.Attached Files
Published - Ciucci2009p6543Physical_Chemistry_Chemical_Physics.pdf
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Additional details
- Eprint ID
- 16994
- Resolver ID
- CaltechAUTHORS:20091216-094534126
- N00014-05-1-0712
- Office of Naval Research
- Created
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2010-01-06Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field