Component interactions after long-term operation of an SOFC stack with LSM cathode
In: Journal of Power Sources, Jg. 201 (2012-03-01), S. 196-203
Online
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Zugriff:
The reliable long-term operation of stacks with a low degradation rate is a prerequisite for the commercialization of solid oxide fuel cell (SOFC) technology. A detailed post-test analysis of stacks is of major importance in understanding degradation mechanisms. Here the results are reported of a post-test analysis of an SOFC stack with anode supported cells with Ni/YSZ anode, 8YSZ electrolyte, and a lanthanum strontium manganite (LSM) cathode operated under steady-state conditions for 19,000 h. In particular, the microstructural and chemical analyses of the relevant metallic and ceramic components are reported. The interconnects were coated with a (Mn,Co,Fe) 3 O 4 spinel by atmospheric plasma spraying, which prevented Cr evaporating into the cathode compartment. The diffusion of Mn from the (La,Sr)MnO 3 cathode into the 8YSZ electrolyte led to local enrichment at grain boundaries, which might have been responsible for the degradation via electronic pathways leading to partial short-circuiting across the electrolyte. However, the ultimate failure of the stack was the result of a weakening and fracture of the 8YSZ electrolyte along grain boundaries due to the local Mn enrichment.
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Component interactions after long-term operation of an SOFC stack with LSM cathode
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Autor/in / Beteiligte Person: | Shemet, Vladimir ; Vaßen, Robert ; Malzbender, Jürgen ; Batfalsky, P. ; Tietz, Frank |
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Zeitschrift: | Journal of Power Sources, Jg. 201 (2012-03-01), S. 196-203 |
Veröffentlichung: | Elsevier BV, 2012 |
Medientyp: | unknown |
ISSN: | 0378-7753 (print) |
DOI: | 10.1016/j.jpowsour.2011.10.117 |
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