Effects of Sr/Ti-ratio in SrTiO3-based SOFC anodes investigated by the use of cone-shaped electrodes
Författare
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.
Avdelning/ar
Publiceringsår
2006
Språk
Engelska
Sidor
1651-1661
Publikation/Tidskrift/Serie
Electrochimica Acta
Volym
52
Issue
4
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Pergamon Press Ltd.
Ämne
- Chemical Sciences
Nyckelord
- Magnéli phases
- Area normalization
- A-site deficiency
- Cone-shaped electrode
- SrTiO3
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0013-4686