Abstract
Mixed ionic-electronic conducting (MIEC) materials are of great interest for a variety of high-temperature applications, such as dense ceramic oxygen transport membranes (OTMs) for gas separation. Several MIEC perovskite oxides, e.g., Ba0.5Sr0.5Co0.8Fe0.2O3-δ, La0.58Sr0.4Co0.2Fe0.8O3-δ, or La0.6Sr0.4CoO3-δ exhibit excellent oxygen-ionic and electronic transport properties and are, hence, promising candidates for high-permeation OTMs. It is essential, though, to determine their chemical stability and electrochemical transport properties (D δ and k δ) over a broad range of oxygen partial pressure pO2 first. This can both be achieved in a custom-made zirconia “oxygen pump” setup. Surface oxygen exchange (k δ) becomes rate-determining for oxygen permeation of high-performing thin OTMs. Further increase of oxygen flux requires an enhancement of surface exchange. This can be achieved by modifying the OTM surfaces with a porous functional layer. With the help of a 3D FEM OTM model the interplay of transport parameters and functional-layer microstructure (thickness, porosity, particle sizes) can be readily assessed.
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