Rapid oxygen ion diffusion and surface exchange kinetics in PrBaCo2O5+x with a perovskite related structure and ordered A cations

被引：542

作者：

Kim, G.

Wang, S.

Jacobson, A. J. ^{[1
]}

Reimus, L.

Brodersen, P.

Mims, C. A.

机构：

[1] Univ Houston, Dept Chem, Houston, TX 77204 USA

[2] Univ Toronto, Dept Chem Engn, Toronto, ON M5S 3E5, Canada

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2007年 / 17卷 / 24期

关键词：

D O I：

10.1039/b618345j

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：

As part of an investigation of new cathode materials for intermediate temperature solid oxide fuel cells, we have investigated particular perovskite oxides with ordered A cations which, in turn, localize the oxygen vacancies into layers. The oxygen exchange kinetics of polycrystalline samples of the oxygen-deficient double perovskite PrBaCo2O5+x (PBCO) have been determined by electrical conductivity relaxation (ECR) and by oxygen-isotope exchange and depth profiling (IEDP). The ECR and IEDP measurements reveal that PBCO has high electronic conductivity and rapid oxygen ion diffusion and surface exchange kinetics. Both techniques demonstrate that the oxygen kinetics in this structure type are significantly faster than in corresponding disordered perovskites.

引用

页码：2500 / 2505

页数：6

共 33 条

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