Song Shuqing, Liu Qi, Swathilakshmi S, Chi Heng-Yu, Zhou Zongyao, Goswami Ranadip, Chernyshov Dmitry, Agrawal Kumar Varoon
Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Sion CH-1950, Switzerland.
Swiss-Norwegian Beam Lines at European Synchrotron Radiation Facility, Grenoble 38043, France.
Sci Adv. 2024 Dec 13;10(50):eads6315. doi: 10.1126/sciadv.ads6315.
High-performance membrane-based H/CO 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/CO selectivity under pressurized conditions due to defective transport pathways. Here, we introduce a simple, eco-friendly synthesis of ultrathin, intergrown Zn(benzimidazole) 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 permselectivity under pressurized conditions. The combination of rapid, green synthesis and high-performance separation makes these membranes highly attractive for precombustion applications.
基于高性能膜的H/CO分离为降低燃烧前捕获的能源成本提供了一条很有前景的途径。目前的膜通常由二维层状材料如金属有机框架制成，由于其复杂的制造方法需要高温、有机溶剂和较长的合成时间，因而存在局限性。由于传输路径存在缺陷，这些过程在加压条件下往往导致H/CO选择性较差。在此，我们介绍一种简单、环保的合成超薄、相互生长的Zn(苯并咪唑)膜的方法，该膜薄至4 nm。这些膜在室温下以水为溶剂制备，合成时间仅为10分钟。通过使用超稀前驱体溶液，成核被延迟，促进了在光滑石墨烯基底上的快速面内生长并消除了缺陷。这些膜在加压条件下表现出优异的H渗透选择性。快速、绿色合成与高性能分离的结合使得这些膜在燃烧前应用中极具吸引力。
