Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 36, Pages 10895-10898Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201604035
Keywords
ceramic membranes; dual-phase composites; electron conductors; hydrogen permeation; proton conductors
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Funding
- Natural Science Foundation of China for Distinguished Young Scholars of China [21225625]
- Natural Science Foundation of China [21536005]
- Natural Science Foundation of the Guangdong Province [2014A030312007]
- Sino-German Center for Science Promotion, Beijing [GZ 911]
- Alexander von Humboldt Foundation
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A novel concept for the preparation of multiphase composite ceramics based on demixing of a single ceramic precursor has been developed and used for the synthesis of a dual-phase H-2-permeable ceramic membrane. The precursor BaCe0.5Fe0.5O3- decomposes on calcination at 1370 degrees C for 10h into two thermodynamically stable oxides with perovskite structures: the cerium-rich oxide BaCe0.85Fe0.15O3- (BCF8515) and the iron-rich oxide BaCe0.15Fe0.85O3- (BCF1585), 50mol% each. In the resulting dual-phase material, the orthorhombic perovskite BCF8515 acts as the main proton conductor and the cubic perovskite BCF1585 as the main electron conductor. The dual-phase membrane shows an extremely high H-2 permeation flux of 0.76mLmin(-1)cm(-2) at 950 degrees C with 1.0mm thickness. This auto-demixing concept should be applicable to the synthesis of other ionic-electronic conducting ceramics.
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