Electrochemical AC impedance model of a solid oxide fuel cell and its application to diagnosis of multiple degradation modes

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2007.02.010
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TypeArticle
Journal titleJournal of Power Sources
Volume167
Issue1
Pages100110; # of pages: 11
SubjectSolid oxide fuel cell; Delamination; Degradation; Diagnostics; Sulphur poisoning; Chromium deposition
AbstractA finite element model of the impact of diverse degradation mechanisms on the impedance spectrum of a solid oxide fuel cell is presented as a tool for degradation mode identification. Among the degradation mechanisms that cause electrode active area loss, the attention is focused on electrode delamination and uniformly distributed surface area loss, which were found to cause distinct and specific changes in the impedance spectrum. Degradation mechanisms resulting in uniformly distributed reactive surface area loss include sintering, sulphur poisoning, and possibly incipient coke formation at the anode, and chromium deposition at the cathode. Parametric studies reveal the extent and limits of applicability of the model and detectability of the different degradation modes, as well as the influence of different cell geometries on the change in impedance behaviour resulting from the loss of active area. It is expected that this technique could form the basis of a useful diagnostic tool for both solid oxide fuel cell developers and users.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
NPARC number9722861
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Record identifier9b8e2884-8a84-46a1-922d-0b03cb977741
Record created2009-07-17
Record modified2016-05-09
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