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Oxygen permeation membranes (OPMs) are regarded as promising technology for pure oxygen production. Among various materials for OPMs, perovskite oxides with mixed electron and oxygen-ion (e - /O 2- ) conducting capability have attracted particular interest because of the high O 2- conductivity and structural/compositional flexibility. However, BaCoO 3-δ -based perovskites as one of the most investigated OPMs suffer from low oxygen permeation rate and inferior structural stability in CO 2 -containing atmospheres. Herein, zirconium and yttrium co-doped BaCoO 3-δ (BaCo 1-2x Zr x Y x O 3-δ , x = 0, 0.05, 0.1 and 0.15) are designed and developed for efficient and stable OPMs by stabilizing the crystal structure of BaCoO 3-δ . With the increased Zr/Y co-doping content, the crystal structural stability of doped BaCoO 3-δ is much improved although the oxygen permeation flux is slightly reduced. After optimizing the co-doping amount, BaCo 0.8 Zr 0.1 Y 0.1 O 3-δ displays both a high rate and superior durability for oxygen permeation due to the well-balanced grain size, oxygen-ion mobility, crystal structural stability, oxygen vacancy concentration and surface exchange/bulk diffusion capability. Consequently, the BaCo 0.8 Zr 0.1 Y 0.1 O 3-δ membrane delivers a high oxygen permeation rate of 1.3 mL min -1 cm -2 and relatively stable operation at 800 ∘C for 100 h. This work presents a promising co-doping strategy to boost the performance of perovskite-based OPMs, which can promote the industrial application of OPM technology.

Zirconium and Yttrium Co-Doped BaCo0.8Zr0.1Y0.1O3-δ: A New Mixed-Conducting Perovskite Oxide-Based Membrane for Efficient and Stable Oxygen Permeation