Abstract
Results on the oxygen permeability and stability of perovskite-type (LSCF) coated with (SDC) are presented. Bilayer structures were formed by depositing a thin layer of SDC by pulsed laser deposition (PLD) on the reducing side of the membrane. Oxygen permeation fluxes measured with air on the feed side and mixtures on the sweep or reducing side are compared with noncoated results. With the introduction of into the He sweep, LSCF samples exhibit very high oxygen flux values but degrade rapidly as the membrane decomposes to less conductive phases. In contrast, LSCF/SDC bilayer membranes under similar conditions show superior stability and increased oxygen flux over a period of greater than 50 h. During reaction runs with a cyclic redox reaction with respect to ceria was observed and is believed to be due to oscillations in the at the SDC/gas interface. © 2002 The Electrochemical Society. All rights reserved.
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