Glass metal‐organic framework (MOF) films can be fabricated from their crystalline counterparts through a melt‐quenching process and are prospective candidates for gas separation because of the elimination of the grain boundaries in crystalline MOF films. However, current techniques are limited to producing glass MOF films with a thickness of tens of micrometers, which leads to ultralow gas permeances. Here, we report a novel cathodic deposition‐assisted synthesis of glass ZIF‐62 films with a thickness as low as ~1 μm. Electrochemical analyses and deposition experiments suggest that the cathodic deposition can lead to pure crystalline ZIF‐62 films with a controllable thickness of ~2 μm to ~15 μm. Accordingly, glass ZIF‐62 films with a thickness of ~1 μm to ~10 μm can be obtained after a thermal treatment. The fabricated defect‐free glass ZIF‐62 film measuring 2 μm in thickness shows a remarkable CO2/N2 and CO2/CH4 selectivity of 31.4 and 33.4, respectively, with a CO2 permeance which is over 30 times higher than the best‐performing glass ZIF‐62 films in literature.

中文翻译：

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用于高性能气体分离的薄玻璃 MOF 薄膜的阴极沉积辅助合成

玻璃金属有机骨架（MOF）薄膜可以通过熔融淬火工艺由其晶体对应物制成，并且由于消除了晶体 MOF 薄膜中的晶界，因此成为气体分离的潜在候选者。然而，目前的技术仅限于生产厚度为数十微米的玻璃MOF薄膜，这导致透气性超低。在这里，我们报告了一种新型的阴极沉积辅助合成玻璃 ZIF-62 薄膜，厚度低至约 1 μm。电化学分析和沉积实验表明，阴极沉积可以产生厚度可控的约 2 μm 至约 15 μm 的纯结晶 ZIF-62 薄膜。因此，热处理后可以获得厚度为~1μm至~10μm的玻璃ZIF-62薄膜。所制造的厚度为 2 μm 的无缺陷玻璃 ZIF-62 薄膜表现出卓越的 CO2/N2 和 CO2/CH4 选择性，分别为 31.4 和 33.4，CO2 渗透性比性能最佳的玻璃 ZIF 高 30 倍以上‐62 部文学电影。