Ceramic hydrogen separation membranes are promising devices to be integrated in industrial hydrogen-based technologies using fossil fuel as feedstock. Among all, BaCe_0.65Zr_0.20Y_0.15O_3-δ–Ce_0.8Gd_0.20O_2-δ composite membrane is the most promising ceramic-ceramic system for such application. However, one of the main issues in Ba-containing perovskites is related to Ba loss at the high sintering temperature needed for the complete densification of the material. This work reports the influence of the sintering atmosphere and temperature on the membrane’s densification and phase purity. BaCeO₃ (BC), BaCe_0.65Zr_0.20Y_0.15O_3-δ (BCZY) and a BaCe_0.65Zr_0.20Y_0.15O_3-δ–Ce_0.8Gd_0.20O_2-δ (BCZY-GDC) mixture were used as Ba-sources to modify the sintering atmosphere. The more reactive BC and BCZY systems promoted a solid-state reaction between BCZY and GDC leading to an undesired single mix-phase enriched in barium on the membrane’s surface. The desired asymmetric architecture with the correct stoichiometry was obtained using BCZY-GDC as Ba-source and sintering the membrane at 1550 °C.

陶瓷氢分离膜是有前途的设备，可以集成到使用化石燃料作为原料的基于氢的工业技术中。其中，BaCe _0.65 Zr _0.20 Y _0.15 O3 _-δ– Ce _0.8 Gd _0.20 O2 _-δ复合膜是用于此类应用的最有前景的陶瓷系统。然而，含钡钙钛矿中的主要问题之一与材料完全致密化所需的高烧结温度下的钡损失有关。这项工作报道了烧结气氛和温度对膜的致密化和相纯度的影响。BaCeO ₃（BC），BaCe _0.65 Zr_使用0.20 Y _0.15 O3 _-δ（BCZY）和BaCe _0.65 Zr _0.20 Y _0.15 O3 _-δ- Ce _0.8 Gd _0.20 O2 _-δ（BCZY-GDC）混合物作为Ba源来改变烧结气氛。更具反应性的BC和BCZY系统促进了BCZY和GDC之间的固态反应，从而导致膜表面钡中不期望的单一混合相富集钡。使用BCZY-GDC作为Ba源并在1550°C的温度下烧结膜，可获得具有正确化学计量比的所需不对称结构。