Advancing Molecular Sieving via Å‑Scale Pore Tuning in Bottom-Up Graphene Synthesis

Porous graphene films are attractive as a gas separation membrane given that the selective layer can be just one atom thick, allowing high-flux separation. A favorable aspect of porous graphene is that the pore size, essentially gaps created by lattice defects, can be tuned. While this has been demo...

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Vydáno v:ACS nano Ročník 18; číslo 7; s. 5730 - 5740
Hlavní autoři: Goethem, Cédric Van, Shen, Yueqing, Chi, Heng-Yu, Mensi, Mounir, Zhao, Kangning, Nijmeijer, Arian, Just, Paul-Emmanuel, Agrawal, Kumar Varoon
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States American Chemical Society 07.02.2024
Témata:
nickel
membrane
pore engineering
gas separation
graphene
ISSN:1936-0851, 1936-086X, 1936-086X
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Shrnutí:Porous graphene films are attractive as a gas separation membrane given that the selective layer can be just one atom thick, allowing high-flux separation. A favorable aspect of porous graphene is that the pore size, essentially gaps created by lattice defects, can be tuned. While this has been demonstrated for postsynthetic, top-down pore etching in graphene, it does not exist in the more scalable, bottom-up synthesis of porous graphene. Inspired by the mechanism of precipitation-based synthesis of porous graphene over catalytic nickel foil, we herein conceive an extremely simple way to tune the pore size. This is implemented by increasing the cooling rate by over 100-fold from −1 °C min–1 to over −5 °C s–1. Rapid cooling restricts carbon diffusion, resulting in a higher availability of dissolved carbon for precipitation, as evidenced by quantitative carbon-diffusion simulation, measurement of carbon concentration as a function of nickel depth, and imaging of the graphene nanostructure. The resulting enhanced grain (inter)­growth reduces the effective pore size which leads to an increase of the H2/CH4 separation factor from 6.2 up to 53.3.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/acsnano.3c11885