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1. MXenes with ordered triatomic-layer borate polyanion terminations

Author

Li, Dongqi, Zheng, Wenhao, Gali, Sai Manoj, Sobczak, Kamil, Horák, Michal, Polčák, Josef, Lopatik, Nikolaj, Li, Zichao, Zhang, Jiaxu, Sabaghi, Davood, Zhou, Shengqiang, Michałowski, Paweł P., Zschech, Ehrenfried, Brunner, Eike, Donten, Mikołaj, Šikola, Tomáš, Bonn, Mischa, Wang, Hai I., Beljonne, David, Yu, Minghao, and Feng, Xinliang

Published
2024
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3. Eine Alkin‐verbrückte kovalent organische Gerüstverbindung mit interaktiven Bindungstaschen für das Einfangen von Brom.

Author

De, Ankita, Haldar, Sattwick, Schmidt, Johannes, Amirjalayer, Saeed, Reichmayr, Fanny, Lopatik, Nikolaj, Shupletsov, Leonid, Brunner, Eike, Weidinger, Inez M., and Schneemann, Andreas

Abstract

Copyright of Angewandte Chemie is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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6. High-field and fast-spinning 1H MAS NMR spectroscopy for the characterization of two-dimensional covalent organic frameworks.

Author

Lopatik, Nikolaj, De, Ankita, Paasch, Silvia, Schneemann, Andreas, and Brunner, Eike

Abstract

Two-dimensional (2D) materials, like 2D covalent organic frameworks (COFs), have been attracting increasing research interest. They are usually obtained as polycrystalline powders. Solid-state NMR spectroscopy is capable of delivering structural information about such materials. Previous studies have applied, for example, 13C cross-polarization magic angle spinning (CP MAS) NMR experiments to characterize 2D COFs. Herein, we demonstrate the usefulness of high-field and fast-spinning 1H MAS NMR spectroscopy to resolve and quantify the signals of different 1H species within 2D COFs, including the edge sites and/or defects. Moreover, 1H–13C heteronuclear correlation (HETCOR) spectroscopy has also been applied and can provide improved resolution to obtain further information about stacking effects as well as edge sites/defects. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Redox-Active Metaphosphate-Like Terminals Enable High-Capacity MXene Anodes for Ultrafast Na-Ion Storage

Author

Sun, Boya, Lu, Qiongqiong, Chen, Kaixuan, Zheng, Wenhao, Liao, Zhongquan, Lopatik, Nikolaj, Li, Dongqi, Hantusch, Martin, Zhou, Shengqiang, Wang, Hai I., Sofer, Zdeněk, Brunner, Eike, Zschech, Ehrenfried, Bonn, Mischa, Dronskowski, Richard, Mikhailova, Daria, Liu, Qinglei, Zhang, Di, Yu, Minghao, Feng, Xinliang, Sun, Boya, Lu, Qiongqiong, Chen, Kaixuan, Zheng, Wenhao, Liao, Zhongquan, Lopatik, Nikolaj, Li, Dongqi, Hantusch, Martin, Zhou, Shengqiang, Wang, Hai I., Sofer, Zdeněk, Brunner, Eike, Zschech, Ehrenfried, Bonn, Mischa, Dronskowski, Richard, Mikhailova, Daria, Liu, Qinglei, Zhang, Di, Yu, Minghao, and Feng, Xinliang

Abstract

2D transition metal carbides and/or nitrides, so-called MXenes, are noted as ideal fast-charging cation-intercalation electrode materials, which nevertheless suffer from limited specific capacities. Herein, it is reported that constructing redox-active phosphorus−oxygen terminals can be an attractive strategy for Nb4C3 MXenes to remarkably boost their specific capacities for ultrafast Na+ storage. As revealed, redox-active terminals with a stoichiometric formula of PO2- display a metaphosphate-like configuration with each P atom sustaining three P-O bonds and one P=O dangling bond. Compared with conventional O-terminals, metaphosphate-like terminals empower Nb4C3 (denoted PO2-Nb4C3) with considerably enriched carrier density (fourfold), improved conductivity (12.3-fold at 300 K), additional redox-active sites, boosted Nb redox depth, nondeclined Na+-diffusion capability, and buffered internal stress during Na+ intercalation/de-intercalation. Consequently, compared with O-terminated Nb4C3, PO2-Nb4C3 exhibits a doubled Na+-storage capacity (221.0 mAh g-1), well-retained fast-charging capability (4.9 min at 80% capacity retention), significantly promoted cycle life (nondegraded capacity over 2000 cycles), and justified feasibility for assembling energy−power-balanced Na-ion capacitors. This study unveils that the molecular-level design of MXene terminals provides opportunities for developing simultaneously high-capacity and fast-charging electrodes, alleviating the energy−power tradeoff typical for energy-storage devices.

Published
2022

8. Redox‐Active Metaphosphate‐Like Terminals Enable High‐Capacity MXene Anodes for Ultrafast Na‐Ion Storage

Author

Sun, Boya, primary, Lu, Qiongqiong, additional, Chen, Kaixuan, additional, Zheng, Wenhao, additional, Liao, Zhongquan, additional, Lopatik, Nikolaj, additional, Li, Dongqi, additional, Hantusch, Martin, additional, Zhou, Shengqiang, additional, Wang, Hai I., additional, Sofer, Zdeněk, additional, Brunner, Eike, additional, Zschech, Ehrenfried, additional, Bonn, Mischa, additional, Dronskowski, Richard, additional, Mikhailova, Daria, additional, Liu, Qinglei, additional, Zhang, Di, additional, Yu, Minghao, additional, and Feng, Xinliang, additional

Published
2022
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9. Redox-Active Metaphosphate-Like Terminals EnableHigh-Capacity MXene Anodes for Ultrafast Na-Ion Storage

Author

Sun, Boya, Lu, Qiongqiong, Chen, Kaixuan, Zheng, Wenhao, Liao, Zhongquan, Lopatik, Nikolaj, Li, Dongqi, Hantusch, Martin, Zhou, Shengqiang, Wang, Hai I., Sofer, Zdeněk, Brunner, Eike, Zschech, Ehrenfried, Bonn, Mischa, Dronskowski, Richard, Mikhailova, Daria, Liu, Qinglei, Zhang, Di, Yu, Minghao, and Feng, Xinliang

Subjects
ddc:660
Abstract

Advanced materials 34, 2108682 (2022). doi:10.1002/adma.202108682, D transition metal carbides and/or nitrides, so-called MXenes, are noted as ideal fast-charging cation-intercalation electrode materials, which nevertheless suffer from limited specific capacities. Herein, it is reported that constructing redox-active phosphorus−oxygen terminals can be an attractive strategy for Nb$_4$C$_3$ MXenes to remarkably boost their specific capacities for ultrafast Na$^+$ storage. As revealed, redox-active terminals with a stoichiometric formula of PO$_2$- display a metaphosphate-like configuration with each P atom sustaining three P-O bonds and one P=O dangling bond. Compared with conventional O-terminals, metaphosphate-like terminals empower Nb$_4$C$_3$ (denoted PO$_2$-Nb$_4$C$_3$) with considerably enriched carrier density (fourfold), improved conductivity (12.3-fold at 300 K), additional redox-active sites, boosted Nb redox depth, nondeclined Na$^+$-diffusion capability, and buffered internal stress during Na$^+$ intercalation/de-intercalation. Consequently, compared with O-terminated Nb$_4$C$_3$, PO$_2$-Nb$_4$C$_3$ exhibits a doubled Na$^+$-storage capacity (221.0 mAh g$^{-1}$), well-retained fast-charging capability (4.9 min at 80% capacity retention), significantly promoted cycle life (nondegraded capacity over 2000 cycles), and justified feasibility for assembling energy−power-balanced Na-ion capacitors. This study unveils that the molecular-level design of MXene terminals provides opportunities for developing simultaneously high-capacity and fast-charging electrodes, alleviating the energy−power tradeoff typical for energy-storage devices., Published by Wiley-VCH, Weinheim

Published
2022
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10. High-field and fast-spinning 1 H MAS NMR spectroscopy for the characterization of two-dimensional covalent organic frameworks.

Author

Lopatik N, De A, Paasch S, Schneemann A, and Brunner E

Abstract

Two-dimensional (2D) materials, like 2D covalent organic frameworks (COFs), have been attracting increasing research interest. They are usually obtained as polycrystalline powders. Solid-state NMR spectroscopy is capable of delivering structural information about such materials. Previous studies have applied, for example, 13 C cross-polarization magic angle spinning (CP MAS) NMR experiments to characterize 2D COFs. Herein, we demonstrate the usefulness of high-field and fast-spinning 1 H MAS NMR spectroscopy to resolve and quantify the signals of different 1 H species within 2D COFs, including the edge sites and/or defects. Moreover, 1 H- 13 C heteronuclear correlation (HETCOR) spectroscopy has also been applied and can provide improved resolution to obtain further information about stacking effects as well as edge sites/defects.

Published
2023
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