Performance of double-proveskite YBa0.5Sr0.5Co2O5+δ as cathode material for intermediate-temperature solid oxide fuel cells

✍ Scribed by Jingfeng Xue; Yu Shen; Tianmin He

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 446 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2011.02.090

✦ Synopsis

Electrochemical performance a b s t r a c t Double-proveskite YBa 0.5 Sr 0.5 Co 2 O 5þd (YBSC) was investigated as potential cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). YBSC material exhibited a good chemical compatibility with the La 0.9 Sr 0.1 Ga 0.8 Mg 0.115 Co 0.085 O 2.85 (LSGMC) electrolyte up to 950 C for 2 h. The substitution of Sr for Ba significantly enhanced the electrical conductivity of the YBSC sample compared to undoped YBaCo 2 O 5þd , and also slightly increased the thermal expansion coefficient. At 325 C a semiconductoremetal transition was observed and the maximum electrical conductivity of YBSC was 668 S cm À1 . The maximum power densities of the electrolyte-supported single cell with YBSC cathode achieved 650 and 468 mW cm À2 at 850 and 800 C, respectively. Preliminary results suggested that YBSC could be considered as a candidate cathode material for application in IT-SOFCs.