Oxygen Nonstoichiometry, Electrical Conductivity, Chemical Expansion and Electrode Properties of Perovskite-Type SrFe0.9V0.1O3-δ

被引:0
作者
Ivanov, Aleksei I. [1 ]
Nikitin, Sergey S. [1 ]
Dyakina, Mariya S. [1 ]
Tsipis, Ekaterina V. [1 ]
Patrakeev, Mikhail V. [1 ]
Agarkov, Dmitrii A. [1 ,2 ]
Zverkova, Irina I. [1 ]
Zhigachev, Andrey O. [1 ]
Kedrov, Victor V. [1 ]
Kharton, Vladislav V. [1 ]
机构
[1] RAS, Osipyan Inst Solid State Phys, Chernogolovka 142432, Russia
[2] Moscow Inst Phys & Technol, Dolgoprudnyi 141701, Russia
关键词
vanadium-doped strontium ferrite; defect structure; electrical conductivity; thermal expansion; chemical expansion; SOFC/SOEC electrodes; OXIDE FUEL-CELLS; STRONTIUM FERRITES; DEFECT CHEMISTRY; STABILITY; TRANSPORT; SRVO3;
D O I
10.3390/ma18030493
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
X-ray diffraction analysis of the pseudo-binary SrFe1-xVxO3-delta system showed that the solid solution formation limit at atmospheric oxygen pressure corresponds to x approximate to 0.1. SrFe0.9V0.1O3-delta has a cubic perovskite-type structure with the Pm3<overline>m space group. The oxygen nonstoichiometry variations in SrFe0.9V0.1O3-delta, measured by coulometric titration in the oxygen partial pressure range of 10-21 to 0.5 atm at 1023-1223 K, can be adequately described using an ideal solution approximation with V5+ as the main oxidation state of vanadium cations. This approach was additionally validated by statistical thermodynamic modeling. The incorporation of vanadium decreases both oxygen deficiency and the average iron oxidation state with respect to undoped SrFeO3-delta. As a result, the electrical conductivity, thermal expansion and chemical expansivity associated with the oxygen vacancy formation all become lower compared to strontium ferrite. At 923 K, the conductivity of SrFe0.9V0.1O3-delta is 14% lower than that of SrFeO3-delta but 21% higher compared to SrFe0.9Ta0.1O3-delta. The area-specific polarization resistance of the porous SrFe0.9V0.1O3-delta electrode deposited onto 10 mol.% scandia- and 1 mol.% yttria-co-stabilized zirconia solid electrolyte with a protective Ce0.9Gd0.1O2-delta interlayer, was 0.34 Ohmxcm2 under open-circuit conditions at 1173 K in air.
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页数:22
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