BaCe 0.5 Zr 0.3 Y 0.2 O 3 -La 0.8 Sr 0.2 Cr 0.75 Mn 0.25 O 3 Composite Membrane for Hydrogen Separation

A dual-phase membrane was developed for hydrogen separation. A BaCe0.5Zr0.3Y0.2O3 (BCZY) phase provided a proton conduction pathway while A La0.8Sr0.2Cr0.75Mn0.25O3 (LSCrMn) phase provided an electronic conduction pathway for effective hydrogen permeation. Once each perovskite phase had formed, the powder mixture was attrition-milled and dry-pressed. After sintering a porous–dense–porous trilayer, the phase purity was confirmed by x-ray diffraction. Usage of a powder blanket was critical to avoid undesired phase formation in addition to LSCrMn and BCZY. Total conductivity of the composite was measured to confirm the 3D connectivity of the LSCrMn phase. The hydrogen flux was larger than 2 mL min−1 cm−2, demonstrating the effectiveness of the dual-phase design.