Effects of Sr/Ti-ratio in SrTiO3-based SOFC anodes investigated by the use of cone-shaped electrodes
Author
Summary, in English
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 from 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 (Magnéli phases), was investigated for oxidation of H2 at 700 °C. High temperature treatment at 1000 °C, between the measurements at 700 °C, showed that high content of Magnéli phases leads to faster degradation of the activity. The suitability for using cone-shaped electrodes as a tool for investigating electrode materials is discussed.
Department/s
Publishing year
2006
Language
English
Pages
1651-1661
Publication/Series
Electrochimica Acta
Volume
52
Issue
4
Links
Document type
Journal article
Publisher
Pergamon Press Ltd.
Topic
- Chemical Sciences
Keywords
- Magnéli phases
- Area normalization
- A-site deficiency
- Cone-shaped electrode
- SrTiO3
Status
Published
ISBN/ISSN/Other
- ISSN: 0013-4686