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A-site deficient (Pr₀.₉La₀.₁)₁.₉Ni₀.₇₄Cu₀.₂₁Ga₀.₀₅O₄₊ổ ((PL)₁.₉NCG), with the K₂NiF₄ structure, is found to exhibit higher oxygen transport rates compared with its cation-stoichiometric parent phase. A stable oxygen permeation flux of 4.6 × 10⁻⁷ mol cm⁻² s⁻¹ at 900 °C at a membrane thickness of 0.6 mm is measured, using either helium or pure CO₂ as sweep gas at a flow rate of 30 mL min⁻¹ The oxygen flux is more than two times higher than that observed through A-site stoichiometric (PL)₂.₀NCG membranes operated under similar conditions. The high oxygen transport rates found for (PL)₁.₉NCG are attributed to highly mobile oxygen vacancies, compensating A-site deficiency. The high stability against carbonation gives (PL)₁.₉NCG potential for use, e.g., as a membrane in oxy-fuel combustion processes with CO₂ captureJian Xue, Qing Liao, Wei Chen, Henny J.M. Bouwmeester, Haihui Wang and Armin Feldhof

journal of materials chemistry a

A new CO2-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr0.9La0.1)1.9(Ni0.74Cu0.21Ga0.05)O4+δ