Oxygen permeation of BSCF membrane with varying thickness and surface coating
SCIE
SCOPUS
- Title
- Oxygen permeation of BSCF membrane with varying thickness and surface coating
- Authors
- Hong, WK; Choi, GM
- Date Issued
- 2010-01-15
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) membranes was measured between 750 and 900 degrees C as a function of membrane thickness with or without La0.7Sr0.3CoO3 (LSC) coating layer under controlled Po-2-gradient (Air/He). In order to seethe relative effects of bulk diffusion and surface-exchange kinetics, the thickness of membrane was varied from 0.5 to 2.0 mm. The oxygen-permeation flux at 900 degrees C increased with LSC coating from that of uncoated membrane. For example, it increased similar to 1.8 times for 1 mm-thick BSCF membrane. The characteristic membrane thickness (L-C) which divides the bulk-diffusion limit and surface-exchange kinetics limit was estimated using the modified Wagner equation. The L-C values were 0.55 and 1.10 mm at 900 degrees C for the coated and uncoated BSCF membranes, respectively, and decreased with decreasing temperature. (C) 2009 Elsevier B.V. All rights reserved.
- Keywords
- Membrane; Oxygen permeability; BSCF; The characteristic membrane thickness; Coating; PEROVSKITE-TYPE OXIDES; BA0.5SR0.5CO0.8FE0.2O3-DELTA PEROVSKITE; PERMEABLE MEMBRANE; EXCHANGE KINETICS; THERMAL-EXPANSION; FUEL-CELLS; TEMPERATURE; TRANSPORT; CONDUCTIVITY; PERFORMANCE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26376
- DOI
- 10.1016/J.MEMSCI.2009.09.056
- ISSN
- 0376-7388
- Article Type
- Article
- Citation
- JOURNAL OF MEMBRANE SCIENCE, vol. 346, no. 2, page. 353 - 360, 2010-01-15
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