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|Title:||Materials design for ceramic oxygen permeation membranes : single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferrite||Authors:||Zhang, Junxing
|Keywords:||Engineering::Materials||Issue Date:||2018||Source:||Zhang, J., Zhang, Z., Chen, Y., Xu, X., Zhou, C., Yang, G., . . . Shao, Z. (2018). Materials design for ceramic oxygen permeation membranes : single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferrite. Journal of Membrane Science, 566, 278-287. doi:10.1016/j.memsci.2018.09.004||Journal:||Journal of Membrane Science||Abstract:||Pure oxygen is an important raw material with many important applications. The production of oxygen via a conducting ceramic membrane is a new, cost-effective and advanced technology with the advantage of continuous oxygen production. The perovskite-type mixed-conducting oxide Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) exhibits superb oxygen permeability, yet it suffers from poor phase stability. In this study, we aim to improve the operational stability of the BSCF membrane by introducing a high-valence W6+ ion as a B-site dopant. Its effect on the phase composition, structure, structural stability, electrical conductivity, oxygen transfer rate and oxygen permeability as a membrane is systematically investigated. Upon the partial substitution of cobalt and iron in the W6+-doped BSCF, single/double perovskite composites are formed instead of single perovskite composites. Remarkably, the formation of the single/double perovskite composites enhances the oxygen permeation stability without obviously compromising the oxygen permeability. Among the various materials, the composite with the nominal composition of Ba0.5Sr0.5Co0.8Fe0.1W0.1O3-δ shows the best performance in terms of stability and oxygen permeability. These findings thus introduce a new way to design conducting ceramic membranes for oxygen separation at high temperatures.||URI:||https://hdl.handle.net/10356/139171||ISSN:||0376-7388||DOI:||10.1016/j.memsci.2018.09.004||Rights:||© 2018 Elsevier B.V. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||MSE Journal Articles|
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