期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 28, 页码 11069-11076出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta02708c
关键词
-
资金
- FCT
- POPH [PTDC/CTM/100412/2008, PTDC/CTM/105424/2008]
- FCT Investigator Programme [IF/00280/2012, IF/01344/2014/CP1222/CT0001]
- QREN
- FEDER
- COMPETE Portugal
- European Social Fund, European Union
- FCT through a BPD grant [SFRH/BPD/112282/2015]
- MEC [MAT2013-46452-C4-1-R]
- CAM [S2013/MIT-2753]
- CEU-Santander Research grant
A stabilised orthorhombic perovskite Ba2In1.8S0.2O5+delta was synthesised by a solid state reaction at low-temperature. The mixed (electronic-protonic-oxide-ionic) conducting properties of this composition were investigated in detail for potential interest in a wide range of membrane applications including protonic ceramic fuel cells. The electrochemical analyses performed include impedance spectroscopy under wet/dry conditions of N-2 and O-2 and modified electromotive force measurements in wet/dry mixtures of N-2/O-2. Under dry oxidising conditions, the sample possesses mixed electronic-oxide-ionic contributions to the electrical transport in the whole range of temperatures, associated with the equilibrium between oxygen vacancies and holes. In wet atmospheres, protonic species arise from the hydration reaction. Protons represent the dominant charge carriers for temperatures lower than 550 degrees C, while oxide-ions and holes are the major mobile species for temperatures higher than 700 degrees C. Appreciable mixed contributions to the electrical transport from protons, oxide ions and holes are confirmed between 550 and 700 degrees C. The experimental data obtained from modified electromotive force measurements and impedance spectroscopy fit well with the expected results according to the proposed defect chemistry model.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据