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

Abstract The dual-phase Ce 0.9 Gd 0.1 O 1.95 –La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− 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 La 0.6 Sr 0.4 CoO 3− 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.