Zhijun, ZhaoZhaoZhijunChen, GuoxingGuoxingChenEscobar Cano, GiamperGiamperEscobar CanoKißling, PatrickPatrickKißlingStölting, OliverOliverStöltingBreidenstein, BerndBerndBreidensteinPolarz, SebastianSebastianPolarzBigall, Nadja C.Nadja C.BigallWeidenkaff, AnkeAnkeWeidenkaffFeldhoff, ArminArminFeldhoff2024-02-202024-02-202024-02-19Angewandte Chemie International Edition 63 (8): e2023124 (2024-02-19)https://hdl.handle.net/11420/45822Ruddlesden-Popper-type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade-off by leveraging the anisotropic properties of Nd₂NiO₄+δ. Its (a,b)-plane, having oxygen diffusion coefficient and surface exchange coefficient several orders of magnitude higher than its c-axis, can be aligned perpendicular to the gradient of oxygen partial pressure by a magnetic field (0.81 T). A stable and high oxygen flux of 1.40 mL min−1 cm−2 was achieved for at least 120 h at 1223 K by a textured asymmetric disk membrane with 1.0 mm thickness under the pure CO₂ sweeping. Its excellent operational stability was also verified even at 1023 K in pure CO₂. These findings highlight the significant enhancement in oxygen permeation membrane performance achievable by adjusting the grain orientation. Consequently, Nd₂NiO₄+δ emerges as a promising candidate for industrial applications in air separation, syngas production, and CO2 capture under harsh conditions.en1521-377320248WileyChemistryJournal Article10.1002/anie.202312473Journal Article