Ultrathin pillar-layered MOF membranes with narrow apertures toward ultrafast hydrogen purification

Abstract

Two pillar-layered MOF membranes, CALF-20 and CALF-15, were synthesized on polymeric substrates by in situ interfacial growth under mild conditions. Owing to the ultrasmall thickness of 60 nm and ultramicroporous lattice windows, the membranes exhibited ultrahigh H₂ permeance of over 7000 GPU and H₂/CO₂ selectivity of 30–43.