Zhao Zhijun, Chen Guoxing, Escobar Cano Giamper, Kißling Patrick A, Stölting Oliver, Breidenstein Bernd, Polarz Sebastian, Bigall Nadja C, Weidenkaff Anke, Feldhoff Armin
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3A, 30167, Hannover, Germany.
Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS, Brentanostr. 2a, 63755, Alzenau, Germany.
Angew Chem Int Ed Engl. 2024 Feb 19;63(8):e202312473. doi: 10.1002/anie.202312473. Epub 2023 Dec 18.
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 Nd NiO . 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 cm was achieved for at least 120 h at 1223 K by a textured asymmetric disk membrane with 1.0 mm thickness under the pure CO sweeping. Its excellent operational stability was also verified even at 1023 K in pure CO . These findings highlight the significant enhancement in oxygen permeation membrane performance achievable by adjusting the grain orientation. Consequently, Nd NiO emerges as a promising candidate for industrial applications in air separation, syngas production, and CO capture under harsh conditions.
与钙钛矿氧化物相比，Ruddlesden-Popper型氧化物表现出显著的化学稳定性。然而，它们的氧渗透率较低。我们提出了一种利用NdNiO的各向异性特性来克服这种权衡的方法。其（a，b）平面的氧扩散系数和表面交换系数比其c轴高几个数量级，通过磁场（0.81 T）可使其与氧分压梯度垂直排列。在1223 K下，通过厚度为1.0 mm的织构不对称盘状膜在纯CO吹扫下，至少120 h内实现了1.40 mL·min⁻¹·cm⁻²的稳定且高的氧通量。即使在1023 K的纯CO中，其优异的操作稳定性也得到了验证。这些发现突出了通过调整晶粒取向可显著提高氧渗透膜性能。因此，NdNiO成为在空气分离、合成气生产以及苛刻条件下CO捕获等工业应用中的有前途的候选材料。
