Authors
Yue Qiu, Xinyue Pi, Lin Zhao, Hao Dong, Junfeng Lu, Yumiao Lu, Yanlei Wang, Hongyan He
Published in
ACS nano. Jul 21, 2026. Epub Jul 21, 2026.
Abstract
To bypass the enduring limitations intrinsic to traditional size-sieving separation, alternative materials for CO2/H2 separation need to be developed. Here, we program a permeation inversion in CO2/H2 transport by constructing a nanoconfined ionic liquid membrane through the synergistic engineering of graphene oxide nanosheets and ionic liquids. A substrate-assisted size-selection strategy enables the preferential incorporation of large nanosheets, which form ordered laminates, while short-chain CO2-philic ionic liquids are precisely confined within the interlayer galleries. The resulting membrane exhibits inverted transport behavior, achieving an ultrahigh CO2 permeance of 358.2 GPU and a mixed-gas CO2/H2 selectivity of 201.9 under a 10:90 CO2/H2 feed─surpassing the upper bounds of conventional polymeric and mixed-matrix membranes. Scalability is demonstrated using a five-cell module, in which CO2 flux increases linearly without selectivity loss. Molecular dynamics simulations and spectroscopic studies reveal that the nanoconfined ionic liquid phase creates a continuous, high-solubility pathway for CO2, whereas H2 is largely excluded from the graphene oxide interfaces. This study establishes nanosheet-ionic liquid synergy as a programmable design platform to engineer permeation inversion, offering a scalable route to advanced CO2/H2 separation membranes.
PMID:
42479850
Bibliographic data and abstract were imported from PubMed on 22 Jul 2026.
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