Improved permeability and selectivity in porous graphene for hydrogen purification
CX Huang and HP Wu and KM Deng and WH Tang and EJ Kan, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 25755-25759 (2014).
Porous graphene is a promising material for the realization of low-cost, large-area and lightweight gas separation. However, molecular-sieving membranes based on porous materials reported thus far generally cannot fulfill the requirements of both high permeability and high selectivity. Simultaneously meeting the goals of high permeability and high selectivity remains a great challenge. As we demonstrate here, with the development of an inter-layer-connected porous graphene bilayer, both the permeability and selectivity are significantly improved, and a high criterion of selectivity for H-2 over CH4 (10(24) at room temperature) as well as a high flux of H-2 (2.4 X 10(5) Gas Permeance Unit) has been reached. Our studies highlight a new approach towards the final goal of high-permeability and high-selectivity molecular-sieving membranes using simple structural engineering.
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