La-doped BaCoO3 as IT-SOFC cathode using LaGaO3 base electrolyte

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 192 KB
• Volume: 2002
• Category: Article
• ISSN: 1464-2859
• DOI: 10.1016/s1464-2859(02)11032-7

✦ Synopsis

Intermediate TiO 2 layer stabilizes Pt anode catalyst in H 2 S SOFC

Supported Pt anode catalyst in a hydrogen sulfide SOFC with YSZ electrolyte was examined at 700-900°C. Increasing the anode feed H 2 S concentration did not improve the cell performance, due to Pt anode corruption; reversible formation and decomposition of PtS on the Pt/YSZ interface led to Pt/YSZ electrochemical interface instability. Membrane structure and performance were stabilized by interposing a thin TiO 2 layer between the Pt and YSZ. The stabilized open-circuit voltage depended on anode and cathode feed gas flow rates. This behavior is attributed to reactant crossover, changing the partial pressures of product SO 2 and H 2 O.