Microstructure and area specific resistance of cathodic half cells for solid oxide fuel cells composed of perovskite-type cathodes and Co-alloy-coated ferritic stainless steel interconnects
| Autor: | Xabier Montero, Isao Saeki, Saad Ahmed Sheikh, Hideyuki Murakami, Lu Gan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
020209 energy Alloy Oxide 02 engineering and technology engineering.material Cathodic protection law.invention chemistry.chemical_compound Coating law 0202 electrical engineering electronic engineering information engineering Materials Chemistry Perovskite (structure) Metallurgy Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Cathode Surfaces Coatings and Films chemistry engineering Solid oxide fuel cell 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 406:126659 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2020.126659 |
| Popis: | 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 °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 mΩ cm2, 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. Graphic abstract. |
| Databáze: | OpenAIRE |
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