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. 2020 Jan 24;11:497. doi: 10.1038/s41467-019-14237-4

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© The Author(s) 2020

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. 1 — a The structure of M-TTCOFs obtained through the condensation of 4-formyl-TTF and M-TAPP. b Powder X-ray diffraction patterns of M-TTCOFs. c Scanning electron microscopy image, scale bar = 200 nm. d Transmission electron microscopy image, scale bar = 50 nm. e High-resolution transmission electron microscopy image, scale bar = 2 nm. f The schematic pore structure of Co-TTCOF. g Energy-dispersive X-ray spectroscopy elemental mapping image (the red image is the selected area in g), scale bar = 100 nm.