Oxygen-induced structural hierarchy in 10-nm-thick carbon membranes for high-performance hydrogen separation Article Swipe
Yueqing Shen
,
Cédric Van Goethem
,
Heng‐Yu Chi
,
Yinghui Li
,
Kuang‐Jung Hsu
,
Shiqi Huang
,
Kumar Varoon Agrawal
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.26434/chemrxiv-2025-cdw10
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.26434/chemrxiv-2025-cdw10
Carbon membranes yielding high selectivity as well as high permeance are attractive to advance the membrane-based gas separation. Herein, we report novel ultrathin carbon membranes (UCMs) which deliver exceptional gas separation performance through oxygen-modulated pyrolysis of poly(4-vinylpyridine) precursor. We show that O2 in pyrolysis environment, transforms the otherwise uniform carbon network featuring ~3.9 Å pore structure into disrupted UCMs (d-UCMs) resulting in hierarchical pore structure comprising ~3.4 Å, 3.9 Å, and 5.5 Å pores. This structural hierarchy enables a record combination of H2 permeance exceeding 10,000 gas permeation units (GPUs) and H2/N2 selectivity surpassing 200. Meanwhile, d-UCM exhibits outstanding physical and thermal stability, showing no aging over 7 days of elevated temperature permeance testing, which overcomes the common issue of rapid aging in carbon membranes. Mechanistic investigations reveal that O2 pyrolysis environment selectively removes relatively weakly-bound carbon species, altering pyrolysis intermediates, resulting in a nitrogen-rich framework with disordered nanodomains and hierarchical porosity. This work advances the material chemistry of ultrathin high-performance carbon membranes, attractive for ultrafast and high-precision molecular-sieving for molecular separation.
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- https://doi.org/10.26434/chemrxiv-2025-cdw10
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https://openalex.org/W4415700293Canonical identifier for this work in OpenAlex
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https://doi.org/10.26434/chemrxiv-2025-cdw10Digital Object Identifier
- Title
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Oxygen-induced structural hierarchy in 10-nm-thick carbon membranes for high-performance hydrogen separationWork title
- Type
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articleOpenAlex work type
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2025Year of publication
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2025-10-30Full publication date if available
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Yueqing Shen, Cédric Van Goethem, Heng‐Yu Chi, Yinghui Li, Kuang‐Jung Hsu, Shiqi Huang, Kumar Varoon AgrawalList of authors in order
- Landing page
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https://doi.org/10.26434/chemrxiv-2025-cdw10Publisher landing page
- Open access
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.26434/chemrxiv-2025-cdw10Direct OA link when available
- Cited by
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0Total citation count in OpenAlex
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