Journal
SOLID STATE IONICS
Volume 181, Issue 35-36, Pages 1601-1606Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2010.09.009
Keywords
Fuel cell; Cathode; Mixed proton/electron conductor; Hydration; Perovskite
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Japan Gas Association (JGA)
- Marubun Research Promotion Foundation
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The La1-xSrxSc1-yFeyO3-delta (LSSF) samples were prepared by solid state reaction with heat treatment at 1300 degrees C and subsequent sintering at 1500 degrees C. Hydration behavior, nonstoichiometry of oxide ions, and conductivity of LSSF were investigated. The results revealed that single phase of LSSF was obtained in a wide composition range after the sintering. The concentrations of hydroxide ions in the LSSF samples hydrated at 300 degrees C in the atmosphere of 5% H2O-16% O-2-Ar increased with the increasing Sr content or the decreasing Fe content. No linear relationship between concentration of hydroxide ions and that of oxide ion vacancies was recognized. For example, the concentration of hydroxide ions per unit cell of La0.8Sr0.2ScO2.9 was as high as 1.32 x 10(-1), but a dramatic drop in the concentration of hydroxide ions was observed by introducing just a small amount of Fe of y =0.05. The Fe content of LSSF plays an important role in the hydration properties. In addition, the concentrations of hydroxide ions in La1-xSrxCoO3-delta (LSC) and La1-xSrxCo1-yFeyO3-delta (LSCF) were also measured, and found to be quite low. (C) 2010 Elsevier B.V. All rights reserved.
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