Electrochemical characterization and redox behavior of Nb-doped SrTiO3
Författare
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.
Avdelning/ar
Publiceringsår
2009
Språk
Engelska
Sidor
63-63
Publikation/Tidskrift/Serie
Solid State Ionics
Volym
180
Issue
1
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Chemical Sciences
Nyckelord
- SOFC
- Nb-doped SrTiO3
- Ceramic anode
- Redox stability
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0167-2738