A [COF-300]-[UiO-66] composite membrane with remarkably high permeability and H₂/CO₂ separation selectivity

In the last few years, the scientific community has capitalized on the synergy between different porous materials to develop mixed matrix- and composite membranes with unprecedented performance in gas separation. Admirably, several of these membranes have outperformed the trade-off between permeability and selectivity, and it is reasonable to suggest that these membranes owe their performance to the synergy between different porous materials that these membranes comprise. However, covalent-organic frameworks (COFs) are rather underexplored in the fabrication of composite membranes particularly due to the fabrication challenges. Herein, we report a continuous and uniform layer of COF-300 grown on a UiO-66 membrane to develop the [COF-300]-[UiO-66] composite membrane that exhibits outstandingly high permeability together with excellent H2/CO2 separation selectivity.