Conductivity and redox stability of perovskite oxide SrFe1-xTixO3-δ (x ≤ 0.3)

被引：28
作者：
Cowin, Peter I. [1 ]
Lan, Rong [1 ,2 ]
Petit, Christophe T. G. [1 ]
Tao, Shanwen [1 ,2 ]
机构：
[1] Univ Strathclyde, Dept Chem & Proc Engn, Glasgow G1 1XJ, Lanark, Scotland
[2] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
来源：
SOLID STATE SCIENCES | 2015年 / 46卷
基金：
英国工程与自然科学研究理事会;
关键词：
Conductivity; Perovskite; Strontium ferrite; Anode; Solid oxide fuel cell; FUEL-CELLS; ANODE MATERIALS; NEUTRON-DIFFRACTION; MOSSBAUER; CATHODE; SYSTEM; NONSTOICHIOMETRY; ELECTRODES; OXIDATION; CRYSTAL;
D O I：
10.1016/j.solidstatesciences.2015.05.004
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A solid solution with the cubic perovskite structure was observed for SrFe1-xTixO3-delta (x = 0-0.3), with an increase in the lattice parameters noted upon increasing dopant concentration. Material stability in air was observed for all compounds, with a decrease in conductivity noted upon increasing dopant concentration attributed to a reduction in charge carrier concentration. A reduction in weight proportional to the titanium content was observed upon exposure to 5% H-2/Ar, although reduction at 700 degrees C was observed to elicit a structural transitions and the formation of a secondary phase for samples SrFeO3-delta and SrFe0.9Ti0.1O3-delta respectively. Conductivity measurements at 600 degrees C demonstrated a larger decrease in the conductivity with increasing dopant concentration, while all investigated oxides are stable after reducing in 5% H-2/Ar at 600 degrees C. It was found that the conductivity of SrFe0.8Ti0.2O3-delta and SrFe0.7Ti0.3O3-delta in 5% H-2/Ar is insufficient to be used as anode for SOFCs. In the investigated compositions, SrFe0.9Ti0.1O3-delta exhibits desired conductivity and redox stability, reduced thermal expansion coefficient compared to SrFeO3-delta, which is a promising redox stable anode for IT-SOFCs. (C) 2015 Elsevier Masson SAS. All rights reserved.
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页码：62 / 70
页数：9
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