Sr2Fe4/3Mo2/3O6 as anodes for solid oxide fuel cells

✍ Scribed by Guoliang Xiao; Qiang Liu; Xihui Dong; Kevin Huang; Fanglin Chen

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 275 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2010.07.036

✦ Synopsis

Sr 2 Fe 4/3 Mo 2/3 O 6 has been synthesized by a combustion method in air. It shows a single cubic perovskite structure after being reduced in wet H 2 at 800 • C and demonstrates a metallic conducting behavior in reducing atmospheres at mediate temperatures. Its conductivity value at 800 • C in wet H 2 (3% H 2 O) is about 16 S cm -1 . This material exhibits remarkable electrochemical activity and stability in H 2 . Without a ceria interlayer, maximum power density (P max ) of 547 mW cm -2 is achieved at 800 • C with wet H 2 (3% H 2 O) as fuel and ambient air as oxidant in the single cell with the configuration of Sr 2 Fe 4/3 Mo 2/3 O 6 |La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3 (LSGM)| La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF). The P max even increases to 595 mW cm -2 when the cell is operated at a constant current load at 800 • C for additional 15 h. This anode material also shows carbon resistance and sulfur tolerance. The P max is about 130 mW cm -2 in wet CH 4 (3% H 2 O) and 472 mW cm -2 in H 2 with 100 ppm H 2 S. The cell performance can be effectively recovered after changing the fuel gas back to H 2 .