Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Yisa Zhou, Ying Wu, Haoyu Wu, Jian Xue (), Li Ding, Rui Wang and Haihui Wang ()
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Yisa Zhou: South China University of Technology
Ying Wu: South China University of Technology
Haoyu Wu: Tsinghua University
Jian Xue: South China University of Technology
Li Ding: South China University of Technology
Rui Wang: South China University of Technology
Haihui Wang: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets are ideal candidates for membranes because of their intrinsic in-plane nanopores. However, non-selective defects formed by traditional top-down preparation and the unfavorable re-stacking hinder the application of these nanosheets in gas separation. Herein, we report lamellar g-C3N4 nanosheets as gas separation membranes with a disordered layer-stacking structure based on high quality g-C3N4 nanosheets through bottom-up synthesis. Thanks to fast and highly selective transport through the high-density sieving channels and the interlayer paths, the membranes, superior to state-of-the-art ones, exhibit high H2 permeance of 1.3 × 10−6 mol m−2 s−1 Pa−1 with excellent selectivity for multiple gas mixtures. Notably, these membranes show excellent stability under harsh practice-relevant environments, such as temperature swings, wet atmosphere and long-term operation of more than 200 days. Therefore, such lamellar membranes with high quality g-C3N4 nanosheets hold great promise for gas separation applications.

Date: 2022
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DOI: 10.1038/s41467-022-33654-6

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