Abstract
The effect of the membrane surface on the oxygen permeation performances is not studied to sufficient detail in the literature. However, this paper shows that the roughness, and the surface physico-chemistry can have a large effect on the oxygen semi-performances of the membrane, in particular on the kinetics of oxygen exchanges at the surface of the mixed electronic and ionic conductors. For instance, the kinetic coefficient of oxygen surface exchanges can increase by more than one order of magnitude in relation with the surface roughness for La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite-type membrane. Then, the best oxygen fluxes obtained in this work, i.e. 3.9 10−3 mol m−2 s−1, are close to the best performances reported in the literature for a dense 1 mm in thick membrane. Finally, some assumptions are discussed and argued in detail to explain the effect of the surface of the La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite membrane on their oxygen semi-permeation performances.
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