Details
| Original language | English |
|---|---|
| Article number | 38 |
| Journal | Nature Communications |
| Volume | 12 |
| Issue number | 1 |
| Early online date | 4 Jan 2021 |
| Publication status | Published - Dec 2021 |
Abstract
Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept for the confined growth of metal-organic framework (MOFs) inside a supported COF layer to prepare MOF-in-COF membranes. These membranes feature a unique MOF-in-COF micro/nanopore network, presumably due to the formation of MOFs as a pearl string-like chain of unit cells in the 1D channel of 2D COFs. The MOF-in-COF membranes exhibit an excellent hydrogen permeance (>3000 GPU) together with a significant enhancement of separation selectivity of hydrogen over other gases. The superior separation performance for H2/CO2 and H2/CH4 surpasses the Robeson upper bounds, benefiting from the synergy combining precise size sieving and fast molecular transport through the MOF-in-COF channels. The synthesis of different combinations of MOFs and COFs in robust MOF-in-COF membranes demonstrates the versatility of our design strategy.
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In: Nature Communications, Vol. 12, No. 1, 38, 12.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - MOF-in-COF molecular sieving membrane for selective hydrogen separation
AU - Fan, Hongwei
AU - Peng, Manhua
AU - Strauss, Ina
AU - Mundstock, Alexander
AU - Meng, Hong
AU - Caro, Jürgen
N1 - Funding Information: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, Ca 147/21) and National Natural Science Foundation of China (Program No. 51773012). H.F. is grateful for the financial support from Alexander von Humboldt Foundation.
PY - 2021/12
Y1 - 2021/12
N2 - Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept for the confined growth of metal-organic framework (MOFs) inside a supported COF layer to prepare MOF-in-COF membranes. These membranes feature a unique MOF-in-COF micro/nanopore network, presumably due to the formation of MOFs as a pearl string-like chain of unit cells in the 1D channel of 2D COFs. The MOF-in-COF membranes exhibit an excellent hydrogen permeance (>3000 GPU) together with a significant enhancement of separation selectivity of hydrogen over other gases. The superior separation performance for H2/CO2 and H2/CH4 surpasses the Robeson upper bounds, benefiting from the synergy combining precise size sieving and fast molecular transport through the MOF-in-COF channels. The synthesis of different combinations of MOFs and COFs in robust MOF-in-COF membranes demonstrates the versatility of our design strategy.
AB - Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept for the confined growth of metal-organic framework (MOFs) inside a supported COF layer to prepare MOF-in-COF membranes. These membranes feature a unique MOF-in-COF micro/nanopore network, presumably due to the formation of MOFs as a pearl string-like chain of unit cells in the 1D channel of 2D COFs. The MOF-in-COF membranes exhibit an excellent hydrogen permeance (>3000 GPU) together with a significant enhancement of separation selectivity of hydrogen over other gases. The superior separation performance for H2/CO2 and H2/CH4 surpasses the Robeson upper bounds, benefiting from the synergy combining precise size sieving and fast molecular transport through the MOF-in-COF channels. The synthesis of different combinations of MOFs and COFs in robust MOF-in-COF membranes demonstrates the versatility of our design strategy.
UR - http://www.scopus.com/inward/record.url?scp=85098650290&partnerID=8YFLogxK
U2 - 10.1038/s41467-020-20298-7
DO - 10.1038/s41467-020-20298-7
M3 - Article
C2 - 33397939
AN - SCOPUS:85098650290
VL - 12
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 38
ER -