Proton conduction at the surface of Y-doped BaCeO3

被引：31
|
作者：
Hibino, T [1 ]
Hashimoto, A
Suzuki, M
Sano, M
机构：
[1] Natl Inst Adv Ind Sci & Technol, Nagoya, Aichi 4628510, Japan
[2] Nagoya Univ, Grad Sch Human Informat, Nagoya, Aichi 4640804, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2001年 / 105卷 / 46期
关键词：
D O I：
10.1021/jp0124342
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In our work, 25 mol % of Y3+-doped BaCeO3 (BCY25) showed an extremely low activation energy of 0.3 eV for proton conduction at the surface. The resulting overall conductivity at the surface reached 8.24 x 10(-3) S cm(-1) at 400 degreesC, which was 3, 8, and 28 times higher than conductivities in the bulk of BCY25, 20 mol % Sm3+-doped ceria, and 8 mol % yttriia-stabilized zirconia, respectively. A large H/D isotope effect strongly suggested that the enhanced proton conductivities were due to an advantageous jump of protons between adjacent oxide ions at the surface. Such fast proton conduction enabled an air/fuel sensor using BCY25 as the solid electrolyte to work at 200 degreesC or less.
引用
收藏
页码：11399 / 11401
页数：3
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