Thermodynamic perspective of Sr‐related degradation issues in SOFC s
Source abstract
Abstract
Abstract (La,Sr)(Co,Fe)O 3‐δ is very common as cathode material in SOFC applications. Sr in this type of cathode material is very reactive to form secondary phases with other oxides, which affect micro‐structures and properties of the cathode materials, GDC layers and ZrO 2 ‐based electrolytes. The Sr‐related degradation issues, Cr poisoning and volatile Sr species formation, are studied. As supplement to existing experimental knowledge on Cr poisoning, specific thermodynamic aspects for Cr poisoning are discussed. The thermodynamic calculations show that the partial pressure pCrO 3 has a stronger temperature dependence than pCrO 2 ( OH ) 2 , and when considering the reaction between SrO and CrO 3 (g), dependent on different pCrO 3 and pO 2 , different Sr–Cr–O compounds SrCrO 4 , SrCrO 3 , Sr 3 Cr 2 O 8 or Sr 2 CrO 4 could be formed. In addition, thermodynamic calculations show that in the presence of water vapor, formation of volatile Sr( OH ) 2 is possible as well. pS r( OH ) 2 depends on temperature, pH 2 O and SrO activity and can be of the same order of magnitude as pCrO 2 ( OH ) 2 . Volatile Sr( OH ) 2 can diffuse through the porous GDC layer and react with ZrO 2 ‐based electrolytes to form SrZrO 3 precipitates. The reaction between gaseous Sr species and 8 YSZ sheet is studied experimentally. The surface of the 8 YSZ sheet is investigated by SEM coupled with EDS , confirming the deposition of Sr.
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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Forschungszentrum Juelich GmbH, Institute of Energy and Climate Research IEK‐2 Juelich Germany
Department of Physical Chemistry Eötvös Loránd University Budapest Hungary
Department of Physics Ivanovo State University of Chemistry and Technology Ivanovo Russia
Funding
Bundesministerium für Bildung und Forschung · Ministry of Education and Science of the Russian Federation
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