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. 2023 Mar 27;14:1697. doi: 10.1038/s41467-023-37479-9

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a, b Gas-transport mechanism in PIM-1/ZIF-8 (a) and PIM-1/HZIF-8 (b) MMMs. The gas molecules in the dotted box represent CO₂, N₂, and CH₄ from top to bottom; c Comparison of CO₂/N₂ separation performance obtained in this work with other reported PIM-1/MOF MMMs. Detailed comparison data are available in Supplementary Table 8. Source data are provided as a Source Data file; d Gas separation performance of HZIF-8 within different polymers. P(CO₂) and S(CO₂/N₂) represent the CO₂ permeability and CO₂/N₂ selectivity, respectively. The values on each column stand for the specific enhancement of corresponding membranes.