MIL-101(Cr) Microporous Nanocrystals Intercalating Graphene Oxide Membrane for Efficient Hydrogen Purification.

Graphene oxide (GO) is a promising two-dimensional building block for fabricating high-performance gas separation membrane. Whereas, the tortuous transport pathway may increase the transport distance and lead to low gas permeation rate. Introducing spacers into GO laminates is an effective strategy to enlarge the interlayer channel for enhanced gas permeance. Herein, we proposed to intercalate CO 2 -philic MIL-101(Cr) metal-organic framework nanocrystals into the GO laminates to construct 2D/3D hybrid structure for gas separation. The interlayer channels were partially opened up to accelerate gas permeation. Meanwhile, the intrinsic pores of MIL-101 provided additional transport pathways, and the affinity of MIL-101 to CO 2 molecules contributed higher H 2 /CO 2 sorption selectivity, leading to a simultaneous enhancement in gas permeance and separation selectivity. The MIL-101(Cr)/GO membrane with optimal structures exhibited outstanding and stable mixed-gas separation performance with H 2 permeance of 67.5 GPU and H 2 /CO 2 selectivity of 30.3 during the 120-h continuous test, demonstrating its potential in H 2 purification application.