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- W2076446722 abstract "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." @default.
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- W2076446722 date "2006-11-15" @default.
- W2076446722 modified "2023-09-26" @default.
- W2076446722 title "Oxygen transport model for layered MIEC composite membranes" @default.
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- W2076446722 doi "https://doi.org/10.1016/j.ssi.2006.09.002" @default.
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