Stuart B. Adler

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors Governing Oxygen Reduction in Solid Oxide Fuel Cell Cathodes†Stuart B. AdlerView Author Information Department of Chemical Engineering, University of Washington, Box 351750, Seattle, Washington 98195-1750 Cite this: Chem. Rev. 2004, 104, 10, 4791–4844Publication Date (Web):October 13, 2004Publication History Received30 March 2004Published online13 October 2004Published inissue 1 October 2004https://pubs.acs.org/doi/10.1021/cr020724ohttps://doi.org/10.1021/cr020724oresearch-articleACS PublicationsCopyright © 2004 American Chemical SocietyRequest reuse permissionsArticle Views17399Altmetric-Citations1919LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Diffusion,Electrical properties,Electrodes,Interfaces,Oxygen Get e-Alerts

In this paper we use continuum modeling to analyze the mechanism of the oxygen reduction reaction at a porous mixed‐conducting oxygen electrode. We show that for at 700°C, solid‐state oxygen diffusion and surface exchange dominate the electrochemical behavior, producing effective "chemical" resistances and capacitances. This behavior can be explained both qualitatively and quantitatively in terms of the known bulk and surface properties of the materials. This mechanism appears to be generally valid for mixed conductors with high rates of internal mass transfer, but breaks down for mixed conductors that have poor ionic transport. Our analysis also suggests that, for the best electrode materials, extension of the reaction zone beyond the three‐phase boundary is limited to a few micrometers. We also show that gas phase diffusion resistance can contribute significantly to cell impedance at .