Phase-inversion tape-casting preparation and significant performance enhancement of Ce0.9Gd0.1O1.95-La0.6Sr0.4Co0.2Fe0.8O3−δ dual-phase asymmetric membrane for oxygen separation

The dual-phase Ce0.9Gd0.1O1.95-La0.6Sr0.4Co0.2Fe0.8O3−δ asymmetric membrane was prepared via a phase-inversion tape-casting method. The membrane consisted of a thicker porous support layer and a thinner dense layer. When the dense side of the membrane was coated with a La0.6Sr0.4CoO3−δ catalytic activation layer, the oxygen permeation flux was markedly increased by a factor of 4.1-5.6, reaching 0.45 mL cm−2 min−1 at 900 °C. The flux increase can be attributed to enhanced surface oxygen exhange kinetics.