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Portrait of Reine Wallenberg. Photo: Kennet Ruona

Reine Wallenberg

Professor, Coordinator Materials Science

Portrait of Reine Wallenberg. Photo: Kennet Ruona

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

Author

  • Peter Blennow Tullmar
  • Kent Kammer Hansen
  • Reine Wallenberg
  • Mogens Mogensen

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

  • Centre for Analysis and Synthesis

Publishing year

2006

Language

English

Pages

1651-1661

Publication/Series

Electrochimica Acta

Volume

52

Issue

4

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