Zhu, Yachao and Rajouâ, Khalil and Le Vot, Steven and Fontaine, Olivier and Simon, Patrice
and Favier, Frédéric
Modifications of MXene layers for supercapacitors.
(2020)
Nano Energy, 73. 104734. ISSN 2211-2855
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(Document in English)
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Official URL: https://doi.org/10.1016/j.nanoen.2020.104734
Abstract
The re-stacking of Ti3C2Tx-MXene layers has been prevented by using two different approaches: a facile hard templating method and a pore-forming approach. The expanded MXene obtained by using MgO nanoparticles as hard templates displayed an open morphology based on crumpled layers. The corresponding electrode material delivered 180 F g???? 1 of capacitance at 1 A g???? 1 and maintained 99% of its initial capacitance at 5 A g???? 1 over five thousand charge-discharge cycles. On the other hand, the MXene foam prepared after heating a MXene-urea composite at 550�C, showed numerous macropores on the surface layer and a complex open 3D innerarchitecture. Thanks to this foamy porous structure, the binder-free electrode based on the resulting MXene foam displayed a great capacitance of 203 F g???? 1 at 5 A g???? 1 current density, 99% of which was retained after five thousand cycles. In comparison, the pristine MXene –based electrode delivered 82 F g???? 1, only, in the same operating conditions. An asymmetric device built on a negative MXene foam electrode and a positive MnO2 electrode exhibited an attractive energy density of 16.5 Wh kg???? 1 (or 10 Wh L???? 1) and 160 W kg???? 1 (or 8.5 kW L???? 1) power density. Altogether, the enhanced performances of these nano-engineered 2D materials are a clear demonstration of the efficiency of the chosen synthetic approaches to work out the re-stacking issue of MXene layers.
Item Type: | Article |
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Audience (journal): | International peer-reviewed journal |
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Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Other partners > Université de Montpellier (FRANCE) |
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Deposited On: | 04 Dec 2020 12:43 |
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