Electrochemical characterization and redox behavior of Nb-doped SrTiO3

被引：79

作者：

Blennow, Peter ^{[1
,2
]}

Hansen, Kent K. ^{[1
]}

Wallenberg, L. Reine ^{[2
]}

Mogensen, Mogens ^{[1
]}

机构：

[1] Tech Univ Denmark, Fuel Cells & Solid State Chem Dept, Riso Natl Lab, DK-4000 Roskilde, Denmark

[2] Lund Univ, nCHREM, Kemictr, SE-22100 Lund, Sweden

来源：

SOLID STATE IONICS | 2009年 / 180卷 / 01期

关键词：

Nb-doped SrTiO3; Ceramic anode; SOFC; Redox stability; OXIDE FUEL-CELLS; CONE-SHAPED ELECTRODES; SOLID-STATE IONICS; STRONTIUM-TITANATE; SOFC ANODES; DIFFUSION; SURFACES; KINETICS; PEROVSKITES; TEMPERATURE;

D O I：

10.1016/j.ssi.2008.10.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：63 / +

页数：6

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