A stable BaCeO(3)-based proton conductor for solid oxide fuel cells

作者：Yan Ruiqiang; Wang Qingfeng; Chen Guihua; Huang Weiya; Xie Kui^*

来源：Ionics, 2009, 15(6): 749-752.

DOI：10.1007/s11581-009-0363-z

• SOFC
• BaCeO(3)
• Stability
• Conductivity
• Thermal expansion
• Sintering

In order to improve the chemical stability of BaCeO(3), Ti(4+) was introduced into B site of BaCeO(3) to modify the chemical stability. XRD test demonstrates that BaCe(0.6)Ti(0.2)Y(0.2)O(3-delta) (BCTY) keeps its original pervoskite-type structure at a high doping level of 20%. After exposure in 94% N(2)+ 3% CO(2)+ 3% H(2)O at 700 degrees C for 10 h, BCTY exhibited adequate chemical stability while decomposition was found in BaCe(0.8)Y(0.2)O(3-delta) (BCY). Accordingly, the conductivity of BCTY reaches 0.0072 S/cm at 700 degrees C in humidified hydrogen which is a little lower than BCY (0.0085). Besides, BCTY displayed better sintering characteristics than BCY at high temperatures and the relative density reaches 96.4% and 94.8%, respectively. The two samples also exhibited similar thermal expansion behavior from 30 to 1,000 degrees C. A fuel cell with BCTY as electrolyte exhibited 244 mW/cm(2) at 700 degrees C and the stable short-term performance further proved the stability of BCTY.

• 出版日期2009-12
• 单位台州学院; 中国科学技术大学