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关键词： Solid oxide fuel cell   Cathodic half-cell   Co-W coating   Oxidation   Electrical conductivity   HIGH-TEMPERATURE OXIDATION   ELECTRICAL-CONDUCTIVITY   SOFC CATHODES   BEHAVIOR   COATINGS   SYSTEM   SIZE   CR  

摘要： In order to prevent oxidation and Cr poisoning, a Co-W coating has been applied on ferritic stainless steel (FSS), which is used as the interconnect parts of solid oxide fuel cells (SOFCs). However, the electrical properties of the Co-W-coated stainless steels have not yet been evaluated. In this study, cathodic half-cells were experimentally manufactured with La0.8Sr0.2MnO3 (LSM) and La0.8Sr0.2Co0.8Fe0.2O3 (LSCF) as cathodes, and uncoated, Co-coated, and Co-W-coated FSSs as interconnects, respectively. Then their oxidation property and area-specific resistance (ASR) were evaluated at 800 degrees C. Based on phase identification and microstructural analysis, the Co-W-coating was confirmed to effectively suppress the Cr poisoning of the cathode. The ASR values of the Co-W-coated steel with LSM and LSCF as cathodes were 102 and 97 m Omega cm(2), respectively, which are adequate for SOFC application. Furthermore, when the LSM was applied as a cathode material, the formation of Mn spinels enhanced the adherence between the cathode and interconnected parts. Thus, the combination of Co-W-coated FSS steel with LSM as the cathode material exhibited the optimal combination of electrical conductivity and microstructural stability.