Degradation of oxygen reduction reaction kinetics in porous La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathodes due to aging-induced changes in surface chemistry

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• 作者：Laura C. Baqué ; ^a ; ^{baquel@cab.cnea.gov.ar} ; Analí ; a L. Soldati^a ; Erico Teixeira-Neto^b ; Horacio E. Troiani^a ; Anja Schreiber^c ; Adriana C. Serquis^a
• 关键词：Solid Oxide Fuel Cells ; Degradation ; Surface segregation ; Scanning Transmission Electron Microscopy ; Energy Dispersive Spectroscopy ; Electrochemical Impedance Spectroscopy
• 刊名：Journal of Power Sources
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：337
• 期：Complete
• 页码：166-172
• 全文大小：1606 K
• 卷排序：337

文摘

Surface La- and Sr-enrichment induced by aging LSCFO cathodes at 800 °C for 50 h. Cation redistribution can extend up to ∼400 nm depth under the LSCFO surface. Surface chemical changes detected by high resolution STEM/EDS maps at cathode pores. Oxygen exchange at LSCFO/gas interface hampered by surface chemistry modification. Oxygen ion conductivity remains constant upon aging according to impedance analysis.