Hauptseite > Publikationsdatenbank > Temperature-Induced Structural Reorganization of W-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membranes for Air Separation > print

001     864756
005     20240711085613.0
024 7 _ |a 10.1021/acs.chemmater.9b02213
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024 7 _ |a 1520-5002
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024 7 _ |a 2128/23021
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037 _ _ |a FZJ-2019-04423
082 _ _ |a 540
100 1 _ |a He, Guanghu
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245 _ _ |a Temperature-Induced Structural Reorganization of W-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membranes for Air Separation
260 _ _ |a Washington, DC
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|b American Chemical Society
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520 _ _ |a 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.
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700 1 _ |a Lan, Qianqian
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700 1 _ |a Sohn, Yoo Jung
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700 1 _ |a Baumann, Stefan
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700 1 _ |a Dunin-Borkowski, Prof. Rafal
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700 1 _ |a Meulenberg, Wilhelm A
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700 1 _ |a Jiang, Heqing
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773 _ _ |a 10.1021/acs.chemmater.9b02213
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856 4 _ |y Published on 2019-08-22. Available in OpenAccess from 2020-08-22.
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