Electrochemical characterization and redox behavior of Nb-doped SrTiO3

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.

• Författare: Peter Blennow Tullmar; Kent K. Hansen; Reine Wallenberg; Mogens Mogensen
• Avdelning/ar: Centrum för analys och syntes
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 63-63
• Publikation/Tidskrift/Serie: Solid State Ionics
• Volym: 180
• Issue: 1
• Länkar: http://dx.doi.org/10.1016/j.ssi.2008.10.011
• 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