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Electrochemical characterization and redox behavior of Nb-doped SrTiO3

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Author

Summary, in English

Sr-vacancy compensated Nb-doped SrTiO3 with the nominal composition Sr0.94Ti0.9Nb0.1O3 has been evaluated as a solid oxide fuel cell (SOFC) anode material in terms of redox stability and electrochemical properties. Sr0.94Ti0.9Nb0.1O3 has been synthesized with a recently developed modified glycine-nitrate process. The phase purity and redox behavior have been analyzed with XRD and TGA. The electrochemical properties of Sr0.94Ti0.9Nb0.1O3 and a composite electrode of Sr0.94Ti0.9Nb0.1O3/YSZ have been investigated by electrochemical impedance spectroscopy (EIS) on cone shaped electrodes and on electrodes in a symmetrical cell configuration. The experiments indicated that the Nb-doped SrTiO3 electrodes were redox stable and showed a potential ability to be used as a part of a SOFC anode. The electrochemical activity appeared to be governed by the concentration of defect species (especially Ti3+ and V-0(++)) in the vicinity of the triple phase boundaries. However, the electrocatalytic activity of the materials was not sufficient and it needs to be improved if Nb-doped SrTiO3 based materials are to be realized as SOFC anodes. (C) 2008 Elsevier B.V. All rights reserved.

Publishing year

2009

Language

English

Pages

63-63

Publication/Series

Solid State Ionics

Volume

180

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Keywords

  • SOFC
  • Nb-doped SrTiO3
  • Ceramic anode
  • Redox stability

Status

Published

ISBN/ISSN/Other

  • ISSN: 0167-2738