Mixed protonic–electronic conducting (MPEC) ceramic membranes with high H₂ permeability and stability are significant for practical H₂ separation. CO₂-tolerant lanthanum tungstate oxides have received much attention, but their low H₂ permeability is their main problem for membrane applications. Herein, an efficient in-situ exsolution strategy is proposed to enhance the H₂ permeability and CO₂ stability of lanthanum tungstate-type membranes. During H₂ permeation, the catalytic Pd nanoparticles are in-situ generated from the bulk oxide lattices and dispersed evenly on the membrane surfaces, which greatly promotes the H₂ surface exchange kinetics. Also, the protonic conductivity of the membranes is effectively improved through the introduction of Pd. Consequently, the H₂ permeation flux is increased by 3.5 times and a maximum H₂ flux of 1.3 mL min⁻¹ cm⁻² is achieved at 1000 °C through the La_5.5(W_0.6Mo_0.4)_0.95Pd_0.05O_11.25-δ (LWMPd) membrane. The LWMPd membrane shows outstanding long-term chemical stability during 300 h continuous operation in a CO₂-containing atmosphere. Therefore, this in-situ exsolution formation of Pd nanoparticles provides effective guidance for developing competitive MPEC membranes for H₂ separation and purification.

中文翻译：

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通过原位脱溶策略增强混合质子-导电膜的氢渗透性

_{具有高H 2}渗透性和稳定性的混合质子-电子传导（MPEC）陶瓷膜对于实际的H ₂分离具有重要意义。耐CO ₂的钨酸镧氧化物备受关注，但其低H ₂渗透性是其膜应用的主要问题。在此，提出了一种有效的原位脱溶策略来提高钨酸镧型膜的H ₂渗透性和CO _{2稳定性。}在H ₂渗透过程中，催化的Pd纳米粒子由块状氧化物晶格原位生成并均匀分散在膜表面，极大地促进了H ₂表面交换动力学。此外，通过引入 Pd 有效地提高了膜的质子电导率。因此，通过La _5.5 (W _0.6 Mo _0.4 ) _0.95 Pd _0.05 O _11.25-δ在1000  ℃下，H ₂渗透通量增加了3.5倍并且最大H ₂通量为1.3 mL min ^-1  cm ^-2 (LWMPd) 膜。_{LWMPd 膜在 CO 2}中连续运行 300 小时时表现出出色的长期化学稳定性- 包含气氛。因此，Pd纳米粒子的这种原位外溶形成为开发用于H ₂分离和纯化的具有竞争力的MPEC膜提供了有效的指导。