Journal
SCIENCE ADVANCES
Volume 6, Issue 4, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay9851
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Funding
- EPFL
- Swiss National Science Foundation [PYAPP2_173645]
- Swiss Competence Center for Energy Research: Efficiency of Industrial Processes (SCCER-EIP)
- Swiss National Supercomputing Center, CSCS [s860]
- MARVEL NCCR
- EPFL Fellows program
- Horizon 2020 grant [66566]
- Swiss National Science Foundation (SNF) [PYAPP2_173645] Funding Source: Swiss National Science Foundation (SNF)
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Poly(triazine imide) (PTI), a crystalline g-C3N4, hosting two-dimensional nanoporous structure with an electron density gap of 0.34 nm, is highly promising for high-temperature hydrogen sieving because of its high chemical and thermal robustness. Currently, layered PTI is synthesized in potentially unsafe vacuum ampules in milligram quantities. Here, we demonstrate a scalable and safe ambient pressure synthesis route leading to several grams of layered PTI platelets in a single batch with 70% yield with respect to the precursor. Solvent exfoliation under anhydrous conditions led to single-layer PTI nanosheets evidenced by the observation of triangular g-C3N4 nanopores. Gas permeation studies confirm that PTI nanopores can sieve He and H-2 from larger molecules. Last, high-temperature H-2 sieving from PTI nanosheet-based membranes, prepared by the scalable filter coating technique, is demonstrated with H-2 permeance reaching 1500 gas permeation units, with H-2/CO2, H-2/N-2, and H-2/CH4 selectivities reaching 10, 50, and 60, respectively, at 250 degrees C.
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