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      MXene molecular sieving membranes for highly efficient gas separation

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          Abstract

          Molecular sieving membranes with sufficient and uniform nanochannels that break the permeability-selectivity trade-off are desirable for energy-efficient gas separation, and the arising two-dimensional (2D) materials provide new routes for membrane development. However, for 2D lamellar membranes, disordered interlayer nanochannels for mass transport are usually formed between randomly stacked neighboring nanosheets, which is obstructive for highly efficient separation. Therefore, manufacturing lamellar membranes with highly ordered nanochannel structures for fast and precise molecular sieving is still challenging. Here, we report on lamellar stacked MXene membranes with aligned and regular subnanometer channels, taking advantage of the abundant surface-terminating groups on the MXene nanosheets, which exhibit excellent gas separation performance with H 2 permeability >2200 Barrer and H 2/CO 2 selectivity >160, superior to the state-of-the-art membranes. The results of molecular dynamics simulations quantitatively support the experiments, confirming the subnanometer interlayer spacing between the neighboring MXene nanosheets as molecular sieving channels for gas separation.

          Abstract

          Two-dimensional materials show great potential for membrane technologies, but their disordered channels hinder their molecular sieving performance. Here, Wang, Gogotsi and colleagues design a MXene membrane with ordered nanochannels that exhibits an excellent H 2/CO 2 gas separation performance.

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          VMD: Visual molecular dynamics

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            The rise of graphene

            Graphene is a rapidly rising star on the horizon of materials science and condensed matter physics. This strictly two-dimensional material exhibits exceptionally high crystal and electronic quality and, despite its short history, has already revealed a cornucopia of new physics and potential applications, which are briefly discussed here. Whereas one can be certain of the realness of applications only when commercial products appear, graphene no longer requires any further proof of its importance in terms of fundamental physics. Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed matter physics, where quantum relativistic phenomena, some of which are unobservable in high energy physics, can now be mimicked and tested in table-top experiments. More generally, graphene represents a conceptually new class of materials that are only one atom thick and, on this basis, offers new inroads into low-dimensional physics that has never ceased to surprise and continues to provide a fertile ground for applications.
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              Two-dimensional nanocrystals produced by exfoliation of Ti3 AlC2.

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                Author and article information

                Contributors
                hhwang@scut.edu.cn
                gogotsi@drexel.edu
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                11 January 2018
                11 January 2018
                2018
                : 9
                : 155
                Affiliations
                [1 ]ISNI 0000 0004 1764 3838, GRID grid.79703.3a, School of Chemistry and Chemical Engineering, , South China University of Technology, ; 510640 Guangzhou, China
                [2 ]ISNI 0000 0001 2163 2777, GRID grid.9122.8, Institute of Physical Chemistry and Electrochemistry, , Leibniz University of Hannover, ; Callinstrasse 3A, 30167 Hannover, Germany
                [3 ]ISNI 0000 0001 2181 3113, GRID grid.166341.7, Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute, , Drexel University, ; Philadelphia, PA 19104 USA
                [4 ]ISNI 0000 0004 1760 5735, GRID grid.64924.3d, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), , College of Physics, Jilin University, ; 130012 Changchun, China
                Author information
                http://orcid.org/0000-0002-2917-4739
                http://orcid.org/0000-0001-9423-4032
                Article
                2529
                10.1038/s41467-017-02529-6
                5765169
                29323113
                f243f072-b4c7-4bd6-8057-ca40cdc87a95
                © The Author(s) 2018

                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/.

                History
                : 26 August 2017
                : 6 December 2017
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