2008
DOI: 10.1149/1.2960938
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Assessment of the Cathode Contribution to the Degradation of Anode-Supported Solid Oxide Fuel Cells

Abstract: The degradation of anode-supported cells was studied over 1500 h as a function of cell polarization either in air or oxygen on the cathode side. Based on impedance analysis, contributions of the anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO 2 . Microstructural analysis of the cathode/electrolyte interface carried out after removal of the cathode showed craters on the electrolyte surface where the lanthanu… Show more

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Cited by 58 publications
(62 citation statements)
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“…This is not included in the present study, because a consistent set of data on the temperature dependence of the evolution of the area specific resistance (ASR) of coated MIC could not be found. The relation by Liu et al [35] [40]. It should be emphasised that depending on the humidity, other phenomena, not necessarily related to chromium contamination, may predominantly cause the degradation of the LSMeYSZ cathode [41].…”
Section: Modelling Approachmentioning
confidence: 96%
“…This is not included in the present study, because a consistent set of data on the temperature dependence of the evolution of the area specific resistance (ASR) of coated MIC could not be found. The relation by Liu et al [35] [40]. It should be emphasised that depending on the humidity, other phenomena, not necessarily related to chromium contamination, may predominantly cause the degradation of the LSMeYSZ cathode [41].…”
Section: Modelling Approachmentioning
confidence: 96%
“…After 1375 h, the arc at the high frequency seems to grow, with its peak frequency shifting toward the low frequency from 5.0 ϫ 10 2 Hz at 1375 h to 1.6 ϫ 10 2 Hz at 2700 h, and the overall resistance increases by 0.19 ⍀ cm 2 .I nt h e nickel-cermet anode supported zirconia cells tested for 1500 h at 750°C at various current densities, the high frequency arc is reported to increase with increasing current densities. 31 Compared to the change in the overall resistance, the ohmic resistance change is only 0.05 ⍀ cm 2 , and high current density operation is found to deteriorate polarization resistance. Because the range of the high frequency arc observed on a cell under open potential is closer to that of an arc observed on the cathode symmetrical cell, the high frequency arc is thought to reflect polarization in the cathode rather than polarization in the anode.…”
Section: B126mentioning
confidence: 95%
“…A typical compressed air steam content of 0.1% is assumed. 5 The gaseous CrO 2 (OH) 2 content is governed by mass transport limitations, as suggested by Opila et al 42,43 The equilibrium partial pressures for all chromium species are computed from thermodynamic data produced by Ebbinghaus et al 44 for a Cr 2 O 3 oxide. The modeling here of a Cr 2 O 3 MIC oxide scale yields excessive predictions for chromium contamination since coatings reduce the release of chromium volatile species.…”
Section: Lifetime Analysis -Electrochemical Modelmentioning
confidence: 99%
“…45,46 (v) Electrically-insulating LZO/SZO phases cause severe detrimental effects on LSM-YSZ cathode performance. 5 A lack of quantitative data inhibits detailed modeling, but sufficient data exist to enable prediction of the onset of formation. The thermodynamic data on the critical oxygen partial pressure from Liu et al 6 is interpolated and compared with the local one, computed from the local overpotential in the LSM-YSZ cathode and oxygen gas phase concentration.…”
Section: Lifetime Analysis -Electrochemical Modelmentioning
confidence: 99%
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