Effects of Sr/Ti-ratio in SrTiO3-based SOFC anodes investigated by the use of cone-shaped electrodes

被引：43

作者：

Blennow, Peter ^{[1
]}

Hansen, Kent K.

Wallenberg, L. Reine

Mogensen, Mogens

机构：

[1] Riso Natl Lab, Fuel Cells & Solid State Chem Dept, DK-4000 Roskilde, Denmark

[2] Lund Univ, Ctr Chem & Chem Engn, Natl Ctr HREM, SE-22100 Lund, Sweden

来源：

ELECTROCHIMICA ACTA | 2006年 / 52卷 / 04期

关键词：

A-site deficiency; cone-shaped electrode; area normalization; SrTiO3; Magneli phases;

D O I：

10.1016/j.electacta.2006.03.096

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this work the A-site deficiency limit for undoped SrTiO3, calcined in air or reducing atmosphere, was investigated. XRD and SEM analyses showed that when using the solid-state synthesis route it was difficult to achieve any A-site deficiency. Even very small deviations frorn unity in the Sr/Ti-ratio resulted in impurity phases. The effects of Sr/Ti-ratio on the performance of SrTiO3 anodes for solid oxide fuel cells (SOFCs) was investigated by impedance spectroscopy with cone-shaped electrodes. The electrocatalytic activity of the SrTiO3 cone samples, With various amount of reduced titanium dioxide phases (Maoneli phases), was investigted for oxidation of H, at 700 degrees C. High temperature treatment at 1000 degrees C, between the measurements at 700 degrees C, showed that high content of Magneli phases leads to faster degradation of the activity. The suitability for using cone-shaped electrodes as a tool for investigating electrode materials is discussed. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1651 / 1661

页数：11

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