Journal
JOURNAL OF POWER SOURCES
Volume 167, Issue 2, Pages 430-441Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.02.042
Keywords
solid oxide fuel cell; delamination; impedance spectroscopy; modeling; degradation; diagnostics
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A finite element model has been developed to simulate the steady state and impedance behaviour of a single operating solid oxide fuel cell (SOFC). The model results suggest that electrode delamination can be detected minimally-invasively by using electrochemical impedance spectroscopy. The presence of cathode delarnination causes changes in the cell impedance spectrum that are characteristic of this type of degradation mechanism. These changes include the simultaneous increase in both the series and polarization resistances, in proportion to the delaminated area. Parametric studies show the dependence of these changes on the extent of delamination, on the operating point, and on the kinetic characteristics of the fuel cell under study. (C) 2007 Elsevier B.V. All rights reserved.
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