期刊
CHEMISTRY OF MATERIALS
卷 21, 期 13, 页码 2755-2762出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm900208w
关键词
-
资金
- Gordon and Betty Moore Foundation
- JSPS Postdoctoral Fellowships for Research Abroad
Barium zirconate has attracted particular attention among candidate proton conducting electrolyte materials for fuel cells and other electrochemical applications because of its chemical stability, mechanical robustness, and high bulk proton conductivity. Development of electrochemical devices based on this material, however, has been hampered by the high resistance of grain boundaries, and, due to limited grain growth during sintering, the high number density of such boundaries. Here, we demonstrate a fabrication protocol based on the sol-gel synthesis of nanocrystalline precursor materials and reactive sintering that results in large-grained, polycrystalline BaZr0.8Y0.2O3-delta of total high conductivity, similar to 1 x 10(-2) Scm(-1) at 450 degrees C. The detrimental role of grain boundaries in these materials is confirmed via a comparison of the conductivities of polycrystalline samples with different grain sizes. Specifically, two samples with grain sizes differing by a factor of 2.3 display essentially identical grain interior conductivities, whereas the total grain boundary conductivities differ by it factor of 2.5-3.2, depending on the temperature (with the larger-grained material displaying higher conductivity).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据