High-performance membrane-based H 2 /CO 2 separation offers a promising way to reduce the energy costs of precombustion capture. Current membranes, often made from two-dimensional laminates like metal-organic frameworks, have limitations due to complex fabrication methods requiring high temperatures, organic solvents, and long synthesis time. These processes often result in poor H 2 /CO 2 selectivity under pressurized conditions due to defective transport pathways. Here, we introduce a simple, eco-friendly synthesis of ultrathin, intergrown Zn 2 (benzimidazole) 4 films, as thin as 4 nm. These films are prepared at room temperature using water as the solvent, with a synthesis time of just 10 minutes. By using ultradilute precursor solutions, nucleation is delayed, promoting rapid in-plane growth on a smooth graphene substrate and eliminating defects. These membranes exhibit excellent H 2 permselectivity under pressurized conditions. The combination of rapid, green synthesis and high-performance separation makes these membranes highly attractive for precombustion applications.

中文翻译：

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从 4 nm 厚的取向 Zn 2（苯并咪唑）4 薄膜中实现高性能 H 2 /CO 2 分离


基于膜的高性能 H 2 /CO 2 分离为降低预燃捕获的能源成本提供了一种有前途的方法。目前的膜通常由二维层压板（如金属有机框架）制成，由于复杂的制造方法需要高温、有机溶剂和较长的合成时间，因此存在局限性。由于运输路径有缺陷，这些过程通常会导致 H 2 /CO 2 在加压条件下的选择性较差。在这里，我们介绍了一种简单、环保的超薄、互生 Zn 2（苯并咪唑）4 薄膜合成，厚度仅为 4 nm。这些薄膜是在室温下使用水作为溶剂制备的，合成时间仅为 10 分钟。通过使用超稀前驱体溶液，可以延迟成核，从而促进光滑石墨烯衬底上的面内快速生长并消除缺陷。这些膜在加压条件下表现出优异的 H 2 选择性。快速、绿色合成和高性能分离的结合使这些膜在预燃烧应用中极具吸引力。