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High stability and oxygen permeability are two prominent requirements for theoxygen transport membrane candidates used as industrialization. Herein, wereport several composite membranes based onxwt.%Ce0.9Pr0.1O2(CPO)-(100-x)wt.%Pr0.6Sr0.4Fe0.8Al0.2O3(PSFAO) (x = 50, 60 and75) prepared via a modified Pechini method. Oxygen permeability test revealsthat the 60CPO-40PSFAO composition exhibits the highest oxygen permeability.The oxygen permeation flux through the optimal uncoated 0.33 mm-thickness60CPO-40PSFAO composite can reach 1.03 mL cm-2 min-1 (over the generalrequirement value of 1 mL cm-2 min-1) in air/He atmosphere at 1000 {\deg}C. Insitu XRD performance confirms the optimal 60CPO-40PSFAO sample shows excellentstability in CO2-containing atmospheres. The 60CPO-40PSFAO membrane stillexhibits simultaneously excellent oxygen permeability and phase stability afteroperating for over 100 h at air/CO2 condition at 1000 {\deg}C, which furtherindicates that the 60CPO-40PSFAO composite is likely to be used for oxygensupply in CO2 capture

High CO2-tolerance oxygen permeation dual-phase membranes Ce0.9Pr0.1O2-{\delta}-Pr0.6Sr0.4Fe0.8Al0.2O3-{\delta}