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首页> 外文期刊>Journal of Materials Research >Oxygen semi-permeation properties of La1-xSrxFeO3-delta perovskite membranes under high oxygen gradient
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Oxygen semi-permeation properties of La1-xSrxFeO3-delta perovskite membranes under high oxygen gradient

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摘要

This work is focused on the evaluation of oxygen semi-permeation and electrochemical performances under high oxygen gradient of free cobalt perovskite membrane materials; La1-xSrxFeO3-delta perovskite. For a better understanding of oxygen transport through La1-xSrxFeO3-delta perovskite membranes, the oxygen diffusion, oxygen incorporation, and desorption coefficients were determined under high oxygen gradient in relation to the temperature for La1-xSrxFeO3-delta (with x = 0.1, 0.3, 0.5, and 0.7) by a specific method based on oxygen semi-permeation. The best electrochemical performances were obtained for La0.3Sr0.7FeO3-delta (LSF37) and La0.5Sr0.5FeO3-delta (LSF55) perovskite membranes with oxygen fluxes of 1.7 x 10(-3) and 1.2 x 10(-3) mol/m(2) s at 900 degrees C, respectively. The oxygen incorporation and desorption coefficients of LSF55 were two times lower than those of LSF37 and similar to those of La0.5Sr0.5Fe0.7Ga0.3O3-delta. The values of these coefficients are discussed and compared with the data reported in the literature by isotopic exchange for the similar material compositions.

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