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| Abstract No.: |
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Scheduled at:
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Monday, May 03, 2010, Moor Room 2:20 PM
Power Engineering and SOFC 1
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| Title: |
Plasma sprayed LSCF oxygen electrode for SOFC
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| Authors: |
Asif Ansar* / German Aerospace Center, Germany
Dennis Soysal / Deutsches Zentrum für Luft- und Raumfahrt e.V., Germany
Z. Ilhan/ Deutsches Zentrum für Luft- und Raumfahrt e.V., Germany
N. Wagner/ Deutsches Zentrum für Luft- und Raumfahrt e.V., Germany
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| Abstract: |
La1-xSrxCo0.2Fe0.8O3-ä deposits were developed for oxygen electrode for SOFC using powders of different stochiometery. The manufacturing of functional layer was carried out by atmospheric plasma spraying (APS) using TriplexPro gun. The processing was improved to obtain microstructure exhibiting high gas permeability and no degradation of the powders while attaining high production rates. Dwell time of the particles in the plasma was the established as the critical factor for the degradation and permeability. The improved functional coatings had a porosity of about 20 vol%. The CTE in air flow at 800°C was, however, 15.6 x10-6 K-1. Electrochemical tests on SOFC cells having cathodes of different stochiometery with improved processing were conducted. These cells were produced using metal supported design, had YSZ as electrolyte and NiO+YSZ as anode. No interlayer (such as CGO) between YSZ and LSCF cathode was introduced. At 800°C, power densities of above 640 mW/cm² at 0.7 V were recorded with H2/air for cell having La0.60Sr0.40Co0.2Fe0.8O3-ä as cathode. Cells consisting of La0.58Sr0.4Co0.2Fe0.8O3-ä and La0.78Sr0.2Co0.2Fe0.8O3-ä had 479 and 496 mW/cm² under similar conditions. Using equivalent circuit diagrams the contribution of different polarizations on the cell performance were separated and cathodes were compared. La0.60Sr0.40Co0.2Fe0.8O3-ä was found to have best electrochemical performance followed by La0.58Sr0.40Co0.2Fe0.8O3-ä and La0.78Sr0.20Co0.2Fe0.8O3-ä.
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