A stable La1.95Ca0.05Ce2O7−δ as the electrolyte for intermediate-temperature solid oxide fuel cells

✍ Scribed by Zetian Tao; Lei Bi; Shuming Fang; Wei Liu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 529 KB
• Volume: 196
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2011.03.011

✦ Synopsis

The La 1.95 Ca 0.05 Ce 2 O 7-ı (LCCO) material is successfully synthesized using the Pechini method. The synthesized powders are exposed to atmospheric CO 2 and H 2 with 3% H 2 O at 700 • C. The treated LCCO powders are investigated using X-ray diffraction (XRD) to study the chemical stability. According to the XRD results, LCCO is very stable and shows no reactions with CO 2 or H 2 O. A fuel cell with the LCCO electrolyte is prepared using the suspension spray method and is tested in the range from 600 • C to 700 • C using humidified hydrogen (∼3% H 2 O) as the fuel and static air as the oxidant. An open-circuit potential of 0.832 V and a maximum power density of 259 mW cm -2 are obtained for a single cell with an interface resistance of 0.23 cm 2 at 700 • C.