Modifications of MXene layers for supercapacitors - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Nano Energy Année : 2020

Modifications of MXene layers for supercapacitors

Résumé

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 inner-architecture. 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.

Domaines

Chimie
Fichier principal
Vignette du fichier
Nanoen_2020_FFAVIER.pdf (1.8 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02929166 , version 1 (27-11-2020)

Identifiants

Citer

Yachao Zhu, Khalil Rajoua, Steven Le Vot, Olivier Fontaine, Patrice Simon, et al.. Modifications of MXene layers for supercapacitors. Nano Energy, 2020, 73, pp.104734. ⟨10.1016/j.nanoen.2020.104734⟩. ⟨hal-02929166⟩
90 Consultations
67 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More