Journal
FRONTIERS IN ENERGY RESEARCH
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fenrg.2021.773924
Keywords
nanopore; molecular sieve; molecular dynamics; gas separation membrane; nanoporous graphene
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Funding
- National Natural Science Foundation of China [51876169]
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Two-dimensional bilayer nanopores constructed with graphene-hexagonal boron nitride show promising potential for high-permeance molecular sieving. The quasi-unidirectional molecular transport is achieved due to the distinctive adsorption abilities of gas molecules on the two sides of bilayer nanopores and the inhibited molecular backflow. This work provides a promising approach for ultra-permeable porous membranes with even higher molecular permeance than single-layer atomic-thickness membranes.
Two-dimensional nanopores are very promising for high-permeance molecular sieving, but the molecular backflow from permeate-side to feed-side is not beneficial for improving molecular permeance. We study the quasi-unidirectional molecular transport through a graphene-hexagonal boron nitride bilayer nanopore, aiming to realize a high-permeance molecular sieving. Molecular dynamics simulations of CO2/CH4 separations show that the bilayer pore presents 3.7 times higher selectivity comparing to the single-layer graphene nanopore with the same size. The quasi-unidirectional molecular transport is attributed to the distinctive adsorption abilities of gas molecules on the two sides of bilayer nanopores and the inhibited molecular backflow from permeate-side to feed-side. This work provides a promising way to realize the ultra-permeable porous membranes with molecular permeance even higher than the single-layer atomic-thickness membranes.
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