Non‐selective Defect Minimization towards Highly Efficient Metal‐Organic Framework Membranes for Gas Separation
Article
Article Title | Non‐selective Defect Minimization towards Highly Efficient Metal‐Organic Framework Membranes for Gas Separation |
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ERA Journal ID | 1313 |
Article Category | Article |
Authors | Dorosti, Fatereh, Ge, Lei, Wang, Hao, Bell, John, Lin, Rijia, Hou, Jingwei and Zhu, Zhonghua |
Journal Title | Angewandte Chemie |
Article Number | e202417513 |
Number of Pages | 10 |
Year | 2024 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 0044-8249 |
1433-7851 | |
1521-3773 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/ange.202417513 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/10.1002/ange.202417513 |
Abstract | The persistence of defects in polycrystalline membranes poses a substantial obstacle to reaching the theoretical molecular sieving separation and scaling up production. The low membrane selectivity in most reported literature is largely due to the unavoidable non-selective defects during synthesis, leading to a mismatch between the well-defined pore structure of polycrystalline molecular sieve materials. This paper presents a novel approach for minimizing non-selective defects in metal–organic framework (MOF) membranes by a constricted crystal growth strategy in a confined environment. The in situ ZIF formation using the densely packed seeding array between the substrate and the pre-grown top ZIF layer yields a confined membrane interlayer, which is highly uniform with a tightly packed crystalline structure. Unlike uncontrolled crystal growth, we purposely regulate the interlayer membrane growth in the direction parallel to the substrate. A notable 99 % decrease in defects in the confined interlayer was achieved compared to the random-grown top layer, leading to a ~353 % increment in H2/N2 selectivity over the non-confined reference MOF membrane. The performance of this new membrane sits in the optimal range above the Robeson upper bound. The membrane boasts a balanced high H2 permeability (>5000 Barrer) and selectivity (>50), significantly surpassing peer ZIF membranes. |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400409. Separation technologies |
340207. Metal organic frameworks | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Centre for Future Materials |
https://research.usq.edu.au/item/zq83z/non-selective-defect-minimization-towards-highly-efficient-metal-organic-framework-membranes-for-gas-separation
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