Oxygen selective membranes based on B-site cation-deficient (Ba0.5Sr0.5)(Co0.8Fe0.2)yO3−δ perovskite with improved operational stability
Article
Article Title | Oxygen selective membranes based on B-site cation-deficient (Ba0.5Sr0.5)(Co0.8Fe0.2)yO3−δ perovskite with improved operational stability |
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ERA Journal ID | 1677 |
Article Category | Article |
Authors | Ge, Lei (Author), Ran, Ran (Author), Zhang, Kun (Author), Liu, Shaomin (Author) and Shao, Zongping (Author) |
Journal Title | Journal of Membrane Science |
Journal Citation | 318 (1), pp. 182-190 |
Number of Pages | 9 |
Year | 2008 |
Place of Publication | Netherlands |
ISSN | 0376-7388 |
1873-3123 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.memsci.2008.02.015 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0376738808001592?via%3Dihub |
Abstract | (Ba0.5Sr0.5)(Co0.8Fe0.2)yO3-δ ((BS)(CF)y, 1.00 ≥ y ≥ 0.77) oxides were investigated for oxygen separation application with emphasis on long-term operational stability. Pure phase cubic perovskite was formed at y ≥ 0.83. The oxygen nonstoichiometry increased while electrical conductivity and permeability decreased with the decrease of y. However, the (BS)(CF)0.97 membrane still displayed an attractive oxygen flux as high as 2.4 × 10-6 mol cm-2 s-1 at 900 °C, as compared to 2.5 × 10-6 mol cm-2 s-1 for a cation stoichiometric BSCF membrane. The B-site deficiency greatly restrained the A-site cation diffusion and stabilized the perovskite structure and permeation properties of the membranes. During the long-term operation of the (BS)(CF)0.97 membrane at 850 °C for more than 300 h, a stable permeation flux of (1.8 ± 0.3) × 10-6 mol cm-2 s-1 was achieved. Further investigation demonstrated that the improved importance of oxygen bulk-diffusion regime in the rate-determination of oxygen permeation through the membranes. |
Keywords | oxygen permeation, perovskite, ceramic membrane, Ba0.5Sr0.5Co0.8Fe0.2O3−ı |
ANZSRC Field of Research 2020 | 340210. Solid state chemistry |
400409. Separation technologies | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Nanjing University of Technology, China |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q540v/oxygen-selective-membranes-based-on-b-site-cation-deficient-ba0-5sr0-5-co0-8fe0-2-yo3-perovskite-with-improved-operational-stability
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