Structure Regulation of MOF Nanosheet Membrane for Accurate H<sub>2</sub>/CO<sub>2</sub> Separation
Hongling Song, Yuan Peng, Chenlu Wang, Lun Shu, Chenyu Zhu, Yanlei Wang, Hongyan He, Weishen Yang
Abstract
Abstract High‐purity H 2 production accompanied with a precise decarbonization opens an avenue to approach a carbon‐neutral society. Metal–organic framework nanosheet membranes provide great opportunities for an accurate and fast H 2 /CO 2 separation, CO 2 leakage through the membrane interlayer galleries decided the ultimate separation accuracy. Here we introduce low dose amino side groups into the Zn 2 (benzimidazolate) 4 conformation. Physisorbed CO 2 served as interlayer linkers, gently regulated and stabilized the interlayer spacing. These evoked a synergistic effect of CO 2 adsorption‐assisted molecular sieving and steric hinderance, whilst exquisitely preserving apertures for high‐speed H 2 transport. The optimized amino membranes set a new record for ultrathin nanosheet membranes in H 2 /CO 2 separation (mixture separation factor: 1158, H 2 permeance: 1417 gas permeation unit). This strategy provides an effective way to customize ultrathin nanosheet membranes with desirable molecular sieving ability.