Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance

This chapter presents a strategy to prepare flexible and conductive MXene/graphene supercapacitor electrodes by using electrostatic self-assembly between positively charged rGO modified with poly(diallyldimethylammonium chloride) and negatively charged titanium carbide MXene nanosheets is presented. Similar to graphene, aggregation and face-to-face self- restacking of MXene nanosheets are usually inevitable during drying and electrode fabrication processes owing to the strong van der Waals interaction between adjacent nanosheets. Graphene has been widely used as an electrode material for supercapacitors. Scanning electron microscopy and transmission electron microscopy were employed to observe the morphology and microstructure of the MXene/rGO hybrid films. MXene/rGO hybrid films show self-assembled unique structure with excellent flexibility, significantly increased interlayer spacing, high density and superior electrical conductivity.