Oxygen transport model for layered MIEC composite membranes |
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| Affiliation: | 1. Technical University of Darmstadt, Department of Materials Science, Alarich-Weiss-Strasse 2, 64287 Darmstadt, Germany;2. Nagasaki University, Faculty of Engineering, 1-14 Bunkyo-machi, 852-8521 Nagasaki, Japan;3. JSPS Postdoctoral Fellow, Kojimachi 5-3-1, Chiyoda-ku 102-0083, Tokyo, Japan;4. Kinki University, Department of Electric & Electronic Engineering, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan;1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, DK - 4000 Roskilde, Denmark;2. Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany;3. Institute of Mineralogy and Petrography, University of Hamburg, Grindelallee 48, 20146 Hamburg, Germany;1. Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;2. Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;3. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;4. Product development Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;1. Moldova State University, 60, A. Mateevici Street, Chisinau, MD 2009, Moldavia;2. Petru Poni Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania;3. Gheorghe Asachi Tehnical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 73 Prof. dr. doc. D. Mangeron Street, 700050 Iasi, Romania |
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| Abstract: | Surface exchange resistance can reduce the oxygen transport through dense mixed ionic-electronic conducting (MIEC) membranes. Addition of an MIEC surface layer to a base substrate can reduce the surface exchange resistance. Existing oxygen transport relations that consider bulk diffusion and surface exchange resistance are extended to treat coated membranes formed by depositing a highly conductive, thin layer of MIEC on the surface of a dissimilar MIEC substrate and accounting for the solid/solid interfacial resistance. The oxygen flux through the coated membrane may exceed that through the bare membrane only if: 1) the surface exchange coefficient of the added layer is larger than the surface exchange coefficient of the bare membrane; and 2) the solid/solid interfacial resistance is sufficiently small. In general, deposition of the surface layer on the membrane tube surface exposed to lean gas leads to a larger oxygen flux than deposition of the layer on the oxygen rich side. A La0.5Sr0.5Fe0.8Ga0.2O3-δ/SrCo0.8Fe0.2O3-δ membrane achieved an oxygen outwards flux of 0.45 mL/min⁎cm2 at 1000 °C from an air/helium gradient. This was a ∼ 50% increase over that obtained using an uncoated LSFG tube. |
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