Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 15, Pages 7913-7918Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.05.043
Keywords
Solid oxide fuel cells; A-site deficiency; La-doped SrTiO3; Electrical and ionic conductivities; Thermal stability
Categories
Funding
- National Nature Science Foundation of China [50672009, 20973021]
- 863 Program of National High Technology Research Development Project of China [2006AA11A189]
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A-site-deficient (La0.3Sr0.7)(1-x)TiO3-delta materials were synthesized by conventional solid-state reaction. The A-site deficiency limit in (La0.3Sr0.7)(1-x)TiO3-delta was below 10 mol% in 5%H-2/Ar at 1500 degrees C. A-site deficiency level promoted the sintering process of (La0.3Sr0.7)(1-x)TiO3-delta. The ionic conductivity increased but the electronic conductivity decreased with increasing A-site deficiency level. The ionic conductivity of (La0.3Sr0.7)(0.93)TiO3-delta sample was as high as 0.2-1.6 x 10(-2) S/cm in 500-950 degrees C and 1.0 x 10(-2) S/cm at 800 degrees C, over twice of La0.3Sr0.2TiO3-delta. Its electrical conductivity was in the range of 83-299 S/cm in 50-950 degrees C and 145 S/cm at 800 degrees C. A-site deficiency improved the thermal stability of (La0.3Sr0.7)(1-x)TiO3-delta and ensured the material with a stable electrical performance in different atmospheres. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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