Escobar Cano Giamper, Matsuda Motohide, Zhao Zhijun, Steinbach Frank, Breidenstein Bernd, Petersen Hilke, Graff Andreas, Widenmeyer Marc, Weidenkaff Anke, Feldhoff Armin
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, D-30167, Hannover, Germany.
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.
Adv Sci (Weinh). 2025 Mar;12(12):e2411251. doi: 10.1002/advs.202411251. Epub 2025 Feb 3.
Textured NdNiO bulk ceramic membranes are fabricated via slip casting in a 0.9 T magnetic field generated by neodymium magnets. This process aligns the oxide grains with their easy-magnetization c-axis parallel to the applied magnetic field. Depending on the magnetic field's direction relative to the slip casting, grains orient either with their a,b-plane or c-axis parallel to the normal direction of the disk-shaped ceramic, thus aligning with the oxygen permeation direction. Without the magnetic field, a non-textured bulk membrane is formed. The microstructure and texture of the ceramic membranes are meticulously analyzed using advanced techniques, including X-ray diffraction, scanning and transmission electron microscopy, as well as related methods. Evaluation of the texturing effect on the oxygen permeation performance shows that the a,b-plane textured NdNiO bulk membrane achieves the highest oxygen permeation fluxes between 1023-1223 K. Additionally, it demonstrates impressive CO₂ stability, maintaining effective performance for at least 140 h due to preferential oxygen transport along the a,b-plane. These characteristics make NdNiO an auspicious material for industrial applications as an oxygen transport membrane, outperforming more susceptible perovskite-based materials. Magnetic alignment thus proves to be an effective method for achieving membrane texturing, enabling precise regulation of oxygen transport properties.
通过在钕磁体产生的0.9 T磁场中进行注浆成型来制备织构化的NdNiO块体陶瓷膜。这一过程使氧化物晶粒的易磁化c轴与外加磁场平行排列。根据磁场相对于注浆成型的方向,晶粒的a、b平面或c轴与盘状陶瓷的法线方向平行排列,从而与氧渗透方向一致。在没有磁场的情况下,会形成无织构的块体膜。使用包括X射线衍射、扫描和透射电子显微镜以及相关方法在内的先进技术对陶瓷膜的微观结构和织构进行了细致分析。对织构化对氧渗透性能的影响评估表明,a、b平面织构化的NdNiO块体膜在1023 - 1223 K之间实现了最高的氧渗透通量。此外,它还表现出令人印象深刻的CO₂稳定性,由于沿a、b平面的优先氧传输,其有效性能至少保持140小时。这些特性使NdNiO成为作为氧传输膜用于工业应用的理想材料,优于更易受影响的钙钛矿基材料。因此,磁取向被证明是实现膜织构化的有效方法,能够精确调节氧传输性能。