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Integrated Cr and S poisoning of a La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3−δ) (LSCF) cathode for solid oxide fuel cells

Strontium segregation in a La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3−δ) (LSCF) electrode reacts with Cr and S in a solid oxide fuel cell (SOFC), which can cause cell performance deterioration. Integrated Cr and S poisoning for LSCF cathodes of SOFC was studied at 800 °C of 200 mA cm(−2) (cathodic) for 20 h. A...

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Detalles Bibliográficos
Autores principales: Wang, Cheng Cheng, Gholizadeh, Mortaza, Hou, Bingxue, Fan, Xincan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8690037/
https://www.ncbi.nlm.nih.gov/pubmed/35423037
http://dx.doi.org/10.1039/d0ra09239h
Descripción
Sumario:Strontium segregation in a La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3−δ) (LSCF) electrode reacts with Cr and S in a solid oxide fuel cell (SOFC), which can cause cell performance deterioration. Integrated Cr and S poisoning for LSCF cathodes of SOFC was studied at 800 °C of 200 mA cm(−2) (cathodic) for 20 h. After polarization in Cr and S at 800 °C for 20 h, polarization and ohmic resistances for LSCF were 2.4 Ω cm(2) and 3.4 Ω cm(2), which were larger than those for LSCF electrodes after Cr deposition only and S deposition only, respectively. The results illustrated that Cr and S deposition occurred on the surface of LSCF, which could form SrCrO(4) and SrSO(4). Compared to Cr deposition only and S deposition only, integrated Cr and S deposition was unsystematic, and the degradation phenomenon of Cr and S poisoning was more severe. The integrated Cr and S deposition of the LSCF electrodes was induced via interactions among CrO, SO(2) and segregated SrO from LSCF.