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000020848 084__ $$2WoS$$aElectrochemistry
000020848 084__ $$2WoS$$aEnergy & Fuels
000020848 1001_ $$0P:(DE-Juel1)129755$$aMalzbender, J.$$b0$$uFZJ
000020848 245__ $$aComponent Interactions After Long-Term Operation of an SOFC Stack With LSM Cathode
000020848 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2012
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000020848 520__ $$aThe reliable long-term operation of stacks with a low degradation rate is a prerequisite for the commercialization of solid oxide fuel cell (SOFC) technology. A detailed post-test analysis of stacks is of major importance in understanding degradation mechanisms. Here the results are reported of a post-test analysis of an SOFC stack with anode supported cells with Ni/YSZ anode, 8YSZ electrolyte, and a lanthanum strontium manganite (LSM) cathode operated under steady-state conditions for 19,000h. In particular, the microstructural and chemical analyses of the relevant metallic and ceramic components are reported. The interconnects were coated with a (Mn,Co,Fe)(3) O-4 spinel by atmospheric plasma spraying, which prevented Cr evaporating into the cathode compartment. The diffusion of Mn from the (La,Sr)MnO3 cathode into the 8YSZ electrolyte led to local enrichment at grain boundaries, which might have been responsible for the degradation via electronic pathways leading to partial short-circuiting across the electrolyte. However, the ultimate failure of the stack was the result of a weakening and fracture of the 8YSZ electrolyte along grain boundaries due to the local Mn enrichment. (C) 2011 Elsevier B.V. All rights reserved.
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000020848 65320 $$2Author$$aSolid oxide fuel cell
000020848 65320 $$2Author$$aDegradation
000020848 65320 $$2Author$$aFailure
000020848 65320 $$2Author$$aProtective coating
000020848 65320 $$2Author$$aLanthanum strontium manganite
000020848 7001_ $$0P:(DE-Juel1)VDB2002$$aBatfalsky, P.$$b1$$uFZJ
000020848 7001_ $$0P:(DE-Juel1)129670$$aVaßen, R.$$b2$$uFZJ
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000020848 7001_ $$0P:(DE-Juel1)129667$$aTietz, F.$$b4$$uFZJ
000020848 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2011.10.117$$gVol. 201, p. 196 - 203$$p196 - 203$$q201<196 - 203$$tJournal of power sources$$v201$$x0378-7753$$y2012
000020848 8567_ $$uhttp://dx.doi.org/10.1016/j.jpowsour.2011.10.117
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