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Modifications of MXene layers for supercapacitors

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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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
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
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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