Significant improvement of the oxygen permeation flux of tubular Ba0.5Sr0.5Co0.8Fe0.2O3 - δ membranes covered by a thin La0.6Sr0.4Ti0.3Fe0.7O3 _δ layer

摘要

We present a new method to improve the oxygen flux properties and stability of Ba0.5Sr0.5Co0.8Fe0.2O3-δ tube membrane using a thin layer of La0.6Sr0.4Ti0.3Fe0.7O3 _ δ as protective coatings. The first relevant result is that the La0.6Sr0.4Tio.3Fe0.7O3 _ δ protective layer had an extraordinary positive effect on improving the oxygen permeation flux of the tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ membranes. La0.6Sr0.4Ti0.3Fe0.7O3-δ-coat.ed Ba0.5Sr0.5Co0.8Fe0.2O3-δ tubular membrane showed the highest oxygen permeability with the flux reaching -3 ml cm~-2min~-1 (oxygen purity > 99%) at 950 °C in static atmospheric pressure through a 1.0 mm thick membrane.