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Yu, A.S.,Kim, J.,Oh, T.S.,Kim, G.,Gorte, R.J.,Vohs, J.M. Elsevier 2014 Applied Catalysis A Vol.486 No.-
The effect of modification of the surface of a La<SUB>0.9</SUB>Ca<SUB>0.1</SUB>FeO<SUB>3</SUB> (LCF) membrane by the addition of a porous layer with an infiltrated catalyst on oxygen flux through the membrane in a CO/air gradient was investigated. Membranes with Pt and CeO<SUB>2</SUB> catalysts on the fuel (CO) side and La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>FeO<SUB>3</SUB> (LSF) on the air-side exhibited oxygen permeation fluxes that were 91, 28, and 5.8 times greater at 873K, 973K, and 1073K, respectively, compared to a membrane with unmodified surfaces. The relative contributions of the bulk (R<SUB>b</SUB>) and surface (R<SUB>s</SUB>) resistances to the total resistance to oxygen ion flow (R<SUB>tot</SUB>) were accessed by measuring the oxygen flux as a function of the membrane thickness. R<SUB>s</SUB> was found to dominate R<SUB>tot</SUB>, demonstrating the importance of the surface processes.