This title appears in the Scientific Report :
2019
Please use the identifier:
http://hdl.handle.net/2128/23021 in citations.
Please use the identifier: http://dx.doi.org/10.1021/acs.chemmater.9b02213 in citations.
Temperature-Induced Structural Reorganization of W-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membranes for Air Separation
Temperature-Induced Structural Reorganization of W-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membranes for Air Separation
The practical use of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) prototypical oxygen-transport membrane for air separation is currently hampered by the decomposition of the cubic perovskite into a variant with hexagonal stacking at intermediate temperatures of ≤850 °C, which impairs the oxygen transport. Here,...
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Personal Name(s): | He, Guanghu |
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Lan, Qianqian / Sohn, Yoo Jung / Baumann, Stefan / Dunin-Borkowski, Prof. Rafal / Meulenberg, Wilhelm A (Corresponding author) / Jiang, Heqing (Corresponding author) | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Chemistry of materials, 31 (2019) 18, S. 7487-7492 |
Imprint: |
Washington, DC
American Chemical Society
2019
|
DOI: |
10.1021/acs.chemmater.9b02213 |
Document Type: |
Journal Article |
Research Program: |
Methods and Concepts for Material Development |
Link: |
Restricted Published on 2019-08-22. Available in OpenAccess from 2020-08-22. Restricted |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1021/acs.chemmater.9b02213 in citations.
The practical use of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) prototypical oxygen-transport membrane for air separation is currently hampered by the decomposition of the cubic perovskite into a variant with hexagonal stacking at intermediate temperatures of ≤850 °C, which impairs the oxygen transport. Here, we report the development of a W-doped BSCF composite that contains Fe-rich single perovskite (SP) and W-rich double perovskite (DP) phases with different crystallographic parameters. In contrast to BSCF, the BSCFW SP/DP composite maintains its cubic structure at 800 °C for 200 h, demonstrating its structural stability at intermediate temperatures. We use X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy to show that the enhanced phase stability of the composite is associated with a temperature-induced SP–DP dynamic interaction, which involves W and Fe interdiffusion between the SP and DP phases, dynamically adjusting the chemical composition and limiting structural distortion and new phase formation. The composite exhibits a stable permeation performance in the oxygen-transport membrane during over 150 h operation at 800 and 700 °C, confirming the potential of intermediate-temperature oxygen-transport membranes for air separation and providing insight for designing thermally stable composite oxides. |