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−δ perovskite. For a better understanding of oxygen transport through La1−xSrxFeO3−δ perovskite membranes, the oxygen diffusion, oxygen incorporation, and desorption coefficients were determined under high oxygen gradient in relation to the temperature for La1−xSrxFeO3−δ (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−δ (LSF37) and La0.5Sr0.5FeO3−δ (LSF55) perovskite membranes with oxygen fluxes of 1.7 × 10−3 and 1.2 × 10−3 mol/m2 s at 900 °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−δ. The values of these coefficients are discussed and compared with the data reported in the literature by isotopic exchange for the similar material compositions.

这项工作的重点是在自由氧钙钛矿膜材料的高氧梯度下评估氧的半渗透性和电化学性能。La 1- x Sr x FeO3 -δ钙钛矿。为了更好地了解氧气通过La 1- x Sr x FeO3 -δ钙钛矿膜的输运，在高氧气梯度下确定了与La 1- x Sr x FeO的温度相关的氧扩散，氧结合和解吸系数3−δ（x可以通过基于氧气半渗透的特定方法来确定（例如0.1、0.3、0.5和0.7）。得到最好的电化学性能的La 0.3锶0.7的FeO 3-δ（LSF37）和La 0.5锶0.5的FeO 3-δ（LSF55）钙钛矿膜为1.7×10氧通量-3和1.2×10 -3摩尔/米分别在900°C下2 s。LSF55的氧结合和解吸系数比LSF37低两倍，与La 0.5 Sr 0.5 Fe 0.7 Ga 0.3 O3 -δ相似。对这些系数的值进行了讨论，并将其与文献中通过同位素交换获得的相似材料组成的数据进行比较。