Binder-free 2D MXene/activated carbon for High-performance
Supercapacitors and Methylene Blue Adsorption
Abstract
we have assembled the 2D MXene flakes and acid activated carbon (AAC)
into a 3D sandwich architecture expected to avoid the serious restacking
problem of 2D MXene flakes and develop MXene-based functional materials.
When used for energy storage, 2D MXene, as a flexible, conductive and
electrochemically active binder, furnishes a new perspective and
possibility to assemble flexible and conductive electrodes without any
current collector, binders or conductive additives. The flexible
MXene/AAC 2:1 electrode delivers the specific capacitance of 378 F g-1
at 0.5 A g-1 and a capacitance retention of 88.9% at 30 A g-1.
Impressively, asymmetrical supercapacitors have been assembled with
MXene/AAC hybrids as positive electrode and delivers exceptional
electrochemical properties. The MXene/AAC 2:1//AAC achieves 177 F g-1 at
0.5 A g-1, 97.4% retention after 10000 circles of GCD measurements at 5
A g-1. Moreover, the 3D sandwich architecture of MXene/AAC hybrids with
great specific surface exhibits noteworthy absorption