The oxygen permeability and the CO₂ tolerance of SrCo_xFe_0.9-xNb_0.1O_3-δ (x = 0.1–0.8) perovskite membranes were investigated by varying the composition of cobalt and iron in B-site of perovskite oxides. The experimental results show that the oxygen permeability increases while the CO₂ tolerance decreases with increasing doping ratio of cobalt. The mechanism behind this trend was investigated by in situ high temperature XRD, FE-SEM, TGA, FTIR and XPS characterization techniques. These results indicated that basicity of SrCo_xFe_0.9-xNb_0.1O_3-δ is enhanced with increasing cobalt doping ratio because of a decrease in overall valence of B-site cations which leads to the decrease in electronegativity. Meanwhile, the decrease of valence for B-site cations also forms more oxygen vacancies which lead to the enhancement of oxygen permeability. With this trade-off between permeability and CO₂ tolerance, it is necessary to balance oxygen permeability and stability under CO₂ atmosphere for different applications. These results provide a guideline for the design of CO₂ tolerant perovskite membrane. SCFN181 (SrCo_0.1Fe_0.8Nb_0.1O_3-δ) membrane was the most stable in the series of membranes studied. High oxygen permeation flux of 0.6 mL/min/cm² for 35 h at 900 °C and 0.26 mL/min/cm² flux at 800 °C for subsequent 100 h was achieved through SCFN 181 membrane (1.1 mm-thick) swept by CO₂. With high permeability and high CO₂-tolerant properties, SCFN181 membrane can meet the requirements for future industrial applications.

通过改变钙钛矿氧化物B位中钴和铁的组成，研究了SrCo _x Fe _0.9-x Nb _0.1 O3 _-δ（x = 0.1-0.8）钙钛矿膜的透氧性和CO ₂耐受性。实验结果表明，随着钴掺杂量的增加，透氧性增加，而对CO _2的耐受性降低。通过原位高温XRD，FE-SEM，TGA，FTIR和XPS表征技术研究了这种趋势的机理。这些结果表明，SrCo _x Fe _0.9-x Nb _0.1 O3 _-δ的碱度B-位阳离子的整体价数降低会导致电负性降低，因此随着钴掺杂率的增加而被增强。同时，B-位阳离子价数的减少也形成了更多的氧空位，从而提高了氧的渗透性。由于在透气性和CO ₂耐受性之间进行了折衷，因此有必要在不同应用中平衡氧气的透过性和在CO ₂气氛下的稳定性。这些结果为耐CO ₂钙钛矿膜的设计提供了指导。SCFN181（SrCo _0.1 Fe _0.8 Nb _0.1 O3 _-δ）膜是所研究的一系列膜中最稳定的。通过SCFN 181膜（厚度为1.1 mm）扫过900℃，在900°C下35 h的氧气渗透通量为0.6 mL / min / cm ²，在随后的100 h内为0.26 mL / min / cm ²，通气量为0.26 mL / min / cm ²。 CO ₂。SCFN181膜具有高渗透性和高耐CO ₂性能，可以满足未来工业应用的要求。