Here we report selective separation of high-purity H₂ from a mixture of 50%H₂-50%N₂ at reduced temperatures using novel ceramic hydrogen pumps that feature thin dense BaZr_0·1Ce_0·7Y_0·2O_3−δ (BZCY) electrolytes symmetrically sandwiched between two identical NiO-BZCY electrodes. Scanning electron microscopy observations show nanoporous nickel catalysts in the cermets as produced from in situ slow reduction. Their superior activities for hydrogen dissociation and re-association reactions are confirmed by unprecedently low interfacial polarization resistances from impedance measurements, e.g., 0.006 Ω cm² at 500 °C. The overall hydrogen permeation kinetics is largely limited by relatively slow proton transport through BZCY electrolytes. The measured H₂ fluxes range from 15.8 ml cm⁻²min⁻¹ at 0.68 V and 500 °C to 9.4 ml cm⁻²min⁻¹ at 1.84 V and 350 °C with Faradic efficiencies close to unity. Reducing the H₂ content in the feed gas decreases the H₂ fluxes as well as the upper limiting current density, above which Faradic efficiencies starts to decrease. It is further demonstrated that humidity in the sweep gas and in the H₂-rich feed gas like 50%H₂-50%N₂ does not influence the hydrogen pumping characteristics. In contrast, reducing humidity in the highly H₂-diluted feed gas like 10%H₂-90%N₂ results in a pronounced decrease in the H₂ fluxes and the upper limiting current density.

在这里，我们报告了使用新颖的陶瓷氢泵，在较低的温度下从50％H ₂ -50％N ₂的混合物中选择性分离高纯度H ₂，该氢泵具有稀疏的致密BaZr _0·1 Ce _0·7 Y _0·2 O _{3 -δ}（BZCY）电解质对称地夹在两个相同的NiO-BZCY电极之间。扫描电子显微镜观察表明，金属陶瓷中的纳米多孔镍催化剂是由原位缓慢还原产生的。通过阻抗测量得出的异常低的界面极化电阻（例如0.006Ωcm ^2）证实了它们对氢解离和再缔合反应的优异活性。在500°C下。氢的整体渗透动力学在很大程度上受质子通过BZCY电解质的相对较慢的传输限制。测量的H ₂通量在0.68 V和500°C的15.8 ml cm ^-2 min ^-1到1.84 V和350°C的9.4 ml cm ^-2 min ^-1，法拉第效率接近于1。降低原料气中的H ₂含量会降低H ₂通量以及上限电流密度，在此之上，法拉第效率开始降低。进一步证明，吹扫气和富含H _2的进料气（如50％H ₂ -50％N _2）中的湿度不会影响氢气的泵送特性。相反，降低高度H ₂稀释的进料气（如10％H ₂ -90％N _2）中的湿度会导致H ₂通量和上限电流密度显着降低。