Tuning the Stacking Modes of Ultrathin Two-Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Angewandte Chemie Pub Date : 2023-09-15 DOI:10.1002/ange.202312995

Shizheng Song, Wei Wang, Yali Zhao, Wufeng Wu, Prof. Yanying Wei, Prof. Haihui Wang

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Abstract

Two-dimensional (2D) metal–organic framework (MOF) membranes are considered potential gas separation membranes of the next generation due to their structural diversity and geometrical functionality. However, achieving a rational structure design for a 2D MOF membrane and understanding the impact of MOF nanosheet stacking modes on membrane separation performance remain challenging tasks. Here, we report a novel kind of 2D MOF membrane based on [Cu₂Br(IN)₂]_n (IN=isonicotinato) nanosheets and propose that synergetic stacking modes of nanosheets have a significant influence on gas separation performance. The stacking of the 2D MOF nanosheets is controlled by solvent droplet dynamic behaviors at different temperatures of drop coating. Our 2D MOF nanosheet membranes exhibit high gas separation performances for H₂/CH₄ (selectivity >290 with H₂ permeance >520 GPU) and H₂/CO₂ (selectivity >190 with H₂ permeance >590 GPU) surpassing the Robeson upper bounds, paving a potential way for eco-friendly H₂ separation.

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调节超薄二维金属-有机框架纳米片膜的堆叠模式实现高效氢气分离

二维（2D）金属-有机骨架（MOF）膜由于其结构多样性和几何功能，被认为是下一代潜在的气体分离膜。然而，实现2D MOF膜的合理结构设计和理解MOF纳米片堆叠模式对膜分离性能的影响仍然是具有挑战性的任务。在这里，我们报道了一种基于[Cu2Br（IN）2]n（IN=isonicotinato）纳米片的新型2D MOF膜，并提出纳米片的协同堆叠模式对气体分离性能有显著影响。2D MOF纳米片的堆叠由不同滴涂温度下的溶剂液滴动力学行为控制。我们的2D MOF纳米片膜对H2/CH4（选择性＞290，H2渗透率＞520GPU）和H2/CO2（选择性＞190，H2渗透率＜590GPU）表现出高的气体分离性能，超过了Robeson上限，为环保H2分离铺平了一条潜在的道路。

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来源期刊

Angewandte Chemie 化学科学, 有机化学, 有机合成

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审稿时长

1 months