Ba_xSr_1‐xCo_0.8Fe_0.2O_3‐δ (BSCF) materials with different Ba doping amounts are widely applied as membranes for oxygen separation and electrodes in solid oxide cells. Different opinions were put forward about the effect of Ba contents on the oxygen transport kinetics. In this work, an oxygen permeation model was first used to investigate the effect of Ba content in BSCF (x = 0, 0.1, 0.3, 0.5, 0.7) on the oxygen transport kinetics. The permeation resistance constants were obtained separately through fitting the condition experimental data to the model. With the increase of Ba content, the interfacial oxygen exchange resistance constants of both sides decrease quickly and then increase slightly, while bulk diffusion resistance remains monotone decreasing. The improvement of oxygen permeation flux is mainly contributed by the enhancement of interfacial oxygen exchange kinetics. It is inferred that Ba element may play an important role in the interfacial oxygen reactions.

中文翻译：

---

BaxSr1-xCo0.8Fe0.2O3-δ的氧输运动力学的渗透模型研究

Ba掺杂量不同的Ba _x Sr _1-x Co _0.8 Fe _0.2 O3 _-δ（BSCF）材料被广泛用作固体氧化物电池中的氧分离膜和电极。对于Ba含量对氧输运动力学的影响，提出了不同的看法。在这项工作中，首先使用氧气渗透模型研究BSCF中Ba含量的影响（x= 0、0.1、0.3、0.5、0.7）。通过将条件实验数据拟合到模型中，分别获得抗渗常数。随着Ba含量的增加，两面的界面氧交换阻力常数迅速减小，然后略有增加，而体扩散阻力保持单调下降。氧气渗透通量的改善主要归因于界面氧交换动力学的增强。据推测，Ba元素可能在界面氧反应中起重要作用。