材料科学
超级电容器
堆积
电极
电容
MXenes公司
多孔性
电流密度
介孔材料
图层(电子)
复合数
纳米技术
功率密度
化学工程
复合材料
催化作用
功率(物理)
量子力学
物理
工程类
物理化学
化学
生物化学
核磁共振
作者
Yachao Zhu,Khalil Rajouâ,Steven Le Vot,Olivier Fontaine,Patrice Simon,Frédéric Favier
出处
期刊:Nano Energy
[Elsevier]
日期:2020-07-01
卷期号:73: 104734-104734
被引量:184
标识
DOI:10.1016/j.nanoen.2020.104734
摘要
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.
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