Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation

Eunji Choi, Ji Il Choi, Yong Jae Kim, Yeong Jae Kim, Kiwon Eum, Yunkyu Choi, Ohchan Kwon, Minsu Kim, Wooyoung Choi, Hyungjoon Ji, Seung Soon Jang, Dae Woo Kim

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Zeolitic imidazolate frameworks (ZIFs) are promising for gas separation membrane, but their molecular cut-off differs from that expected from its intrinsic aperture structure because of their flexibility. Herein, we introduced graphene nanoribbons (GNRs) to rigidify the ZIF framework. Because the sp2 edge of the GNRs induces strong anchoring effects, the modified layer can be rigidified. Particularly, when the GNRs were embedded and distributed in the ZIF-8 layer, an intrinsic aperture size of 3.4 Å was observed, resulting in high H2/CO2 separation (H2 permeance: 5.2×10−6 mol/m2 Pa s, ideal selectivity: 142). The performance surpasses the upper bound of polycrystalline MOF membrane performance. In addition, the membrane can be applied to blue H2 production, as demonstrated with a simulated steam reformed gas containing H2/CO2/CH4. The separation performance was retained in the presence of water. The fundamentals of the molecular transport through the rigid ZIF-8 framework were revealed using molecular dynamics simulations.

Original languageEnglish
Article numbere202214269
JournalAngewandte Chemie - International Edition
Volume61
Issue number49
DOIs
Publication statusPublished - 2022 Dec 5

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry

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