oly(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 H2 from larger molecules. Last, high-temperature H2 sieving from PTI nanosheet-based membranes, prepared by the scalable filter coating technique, is demonstrated with H2 permeance reaching 1500 gas permeation units, with H2/CO2, H2/N2, and H2/CH4 selectivities reaching 10, 50, and 60, respectively, at 250°C.

Villalobos, L., Vahdat, M., Dakhchoune, M., Nadizadeh, Z., Mensi, M., Oveisi, E., et al. (2020). Large-scale synthesis of crystalline g-C3N4 nanosheets and high-temperature H2 sieving from assembled films. SCIENCE ADVANCES, 6(4) [10.1126/sciadv.aay9851].

Large-scale synthesis of crystalline g-C3N4 nanosheets and high-temperature H2 sieving from assembled films

Campi, Davide;
2020

Abstract

oly(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 H2 from larger molecules. Last, high-temperature H2 sieving from PTI nanosheet-based membranes, prepared by the scalable filter coating technique, is demonstrated with H2 permeance reaching 1500 gas permeation units, with H2/CO2, H2/N2, and H2/CH4 selectivities reaching 10, 50, and 60, respectively, at 250°C.
Si
Articolo in rivista - Articolo scientifico
Scientifica
Nanopores; Nanosheets; Permeation; Nanoporous structures; Gas permeable membranes
English
Villalobos, L., Vahdat, M., Dakhchoune, M., Nadizadeh, Z., Mensi, M., Oveisi, E., et al. (2020). Large-scale synthesis of crystalline g-C3N4 nanosheets and high-temperature H2 sieving from assembled films. SCIENCE ADVANCES, 6(4) [10.1126/sciadv.aay9851].
Villalobos, L; Vahdat, M; Dakhchoune, M; Nadizadeh, Z; Mensi, M; Oveisi, E; Campi, D; Marzari, N; Agrawal, K
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/392190
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