Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/139171
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
Zhang, Zhenbao
Chen, Yubo
Xu, Xiaomin
Zhou, Chuan
Yang, Guangming
Zhou, Wei
Shao, Zongping
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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