Asymmetric dual-phase membranes for oxygen permeation, Ce_0.85Sm_0.15O_1.925/Sm_0.6Sr_0.4FeO_3-d (SDC-SSF), were fabricated by an acid-leaching technique, i.e., a thin dense layer which consists of SDC-SSF was remained by controlling acid-leaching degree, and a porous substrate which consists of Ce_0.85Sm_0.15O_1.925 (SDC) with fluorite structure was formed with dissolution of Sm_0.6Sr_0.4FeO_3-d(SSF) with perovskite structure in HCl. The acid-leaching method can readily adjust the thickness of thin dense layer and porosity of supporting substrate. Meanwhile, traditional shrinkage mismatch and chemical reaction between thin dense layers and porous substrates can be easily avoided.  The oxygen permeation experiments showed that the as-prepared asymmetric membranes possessed higher oxygen permeation flux.

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