Fine-tuning ultramicroporosity in PIM-1 membranes by aldehyde functionalization for efficient hydrogen separation
Name
2024_TL_PIMCHO_JMCA (1).pdf
Description
Accepted version
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1.12 MB
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Author(s)
Lee, Tae Hoon
Joo, Taigyu
Jean-Baptiste, Philippe
Dean, Pablo A
Yeo, Jing Ying
Smith, Zachary P
Date Issued
August 19, 2024
Journal
Journal of Materials Chemistry A
Publisher
Royal Society of Chemistry
Citation
Tae Hoon Lee, Taigyu Joo, Philippe Jean-Baptiste, Pablo A. Dean, Jing Ying Yeo, Zachary P. Smith; Fine-tuning ultramicroporosity in PIM-1 membranes by aldehyde functionalization for efficient hydrogen separation. J. Mater. Chem. A 2024; 12 (36): 24519–24529.
Version
Author's final manuscript
Abstract
Polymers of intrinsic microporosity (PIMs) have shown great potential for membrane-based hydrogen
separations. The archetypal PIM, PIM-1, features hydrogen permeability that is 2–3 orders of magnitude
higher than that of conventional polymers. However, the hydrogen selectivities of PIM-1 still need to be
improved to meet the purity required for hydrogen production and distribution processes. Herein, we
report a facile approach to fine-tune the microstructure of PIM-1 films by converting the nitrile groups
of PIM-1 into aldehyde groups at room temperature. The aldehyde-functionalized PIM-1 (PIM-CHO) has
a significantly higher concentration of ultramicropores (<7 Å) compared to PIM-1 as confirmed by gas
sorption and X-ray scattering analyses. Ultimately, this feature results in excellent H2/N2 and H2/CH4
separation performance for PIM-CHO, approaching the most recent 2015 upper bound and
outperforming all post-synthetically modified PIM-1 membranes reported to date. Mixed-gas transport
studies also demonstrate the excellent potential of PIM-CHO for its deployment in practical applications.
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DOI of Published Version
https://doi.org/10.1039/d4ta04082a
