Abstract
Perovskite-type oxygen transport membrane (OTM) has considerable potential in the application of oxygen-enriched combustion, which can prepare low-cost, low-energy, and high-purity oxygen. BaCoO3-δ-based OTM, as a promising candidate, possesses high oxygen permeability, but poor stability limits its application. In this study, the strategy of Y3+ and W6+ co-doping BaCo0·8Y0.2-xWxO3-δ (BCYW-x) was proposed firstly to control the trade-off effect between oxygen permeability and stability by considering the radius and valence of ions. Y3+ and W6+ co-doping stabilize the perovskite cubic structure to room temperature of the BCYW-x, and the average bond energy of metal-oxygen increases with W6+ doping, enhancing the structure stability. Although oxygen vacancy concentration and critical radius decrease, the migration of oxygen ions is accelerated with the increase of W6+ content at high temperatures. The BCYW-0.1 shows the exceptional oxygen permeation flux of 1.90 mL･cm−2･min−1 at 900 °C and stably operates at 900 °C and 800 °C. Furthermore, the kinetic model calculation indicates that the permeation resistance decreases because of the acceleration of the oxygen surface exchange reaction as W6+ doping, contributing to the oxygen permeation process. This study provides a feasible and effective co-doping strategy to improve the oxygen permeability and stability of perovskite OTMs simultaneously.
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