Effect of surface modification of Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane for oxygen separation

The effect of surface modification on the oxygen separation properties of permeation membranes is investigated in this work. For this purpose, dense perovskite type membranes of the composition Ba0.5Sr0.5Co0.8Fe0.2O3−δ have been successfully prepared by polymerized complex method. Oxygen permeation experiments were conducted according to membrane thickness (1.0 mm and 1.6 mm) and surface modification. The surface modification of the Ba0.5Sr0.5Co0.8Fe0.2O3−δ dense membranes for measurement of oxygen permeability was done mainly by screen printing technique Ba0.5Sr0.5Co0.8Fe0.2O3-δ powders. The oxygen flux of Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane increased with increasing temperature and with decreasing membrane thickness. The oxygen permeation flux through 1.0 mm membrane thickness with modified surface exposed to flowing air (Ph=0.21 atm) and helium (Pl=10−5 atm) was ca. 1.4 ml/cm2⋅min at 950 °C.