Multiplying oxygen permeability of a Ruddlesden‐Popper oxide by orientation control via magnets

Ruddlesden-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.

Subjects

Conducting Materials | Magnetic Field | Mixed Ionic Electronic Conducting Membranes | Oxygen Separation | Texture

DDC Class

540: Chemistry

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by-nc-nd/4.0/

Name

Angew Chem Int Ed - 2023 - Zhao - Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via.pdf

Type

Main Article

Size

6.94 MB

Format

Adobe PDF

Options

Multiplying oxygen permeability of a Ruddlesden‐Popper oxide by orientation control via magnets