Fabrication of high capacity supercapacitor electrode based on PolyPyrrole/MXene Composite

In this work, we report the synthesis of polypyrrole-Ti3C2Tx composite material to fabricate a high conductive supercapacitor electrode with high charge storage capability. Two dimensional Ti3C2Tx is the first introduced and most conductive member of the MXene family. In addition to high electrical conductivity, its large surface area, and hydrophilicity due to the presence of surface termination groups have made it a promising candidate to be used as an electrode in energy storage devices. The main challenge to using titanium carbide as an active electrode material is the stacking of its two-dimensional layers which leads to the enormous decrement of its active surface area. On the other hand, Polypyrrole is well-known as a conductive polymer (conductivity of about 200 S/m ) with high charge storage capability. However, its relatively low lifetime and agglomeration of its particles prevent it from presenting its charge storage capabilities. In-situ polymerization of Pyrrole on MXene layers to make polypyrrole-Ti3C2Tx composite would be a good way to both de-stack the Ti3C2 layers and prevent the agglomeration of Pyrrole species. A supercapacitor electrode was prepared with the obtained composite powder as the active material. The electrochemical properties of this electrode were assessed in a 0.5 molar KCl solution. The results indicate high electrical conductivity and high capacitance of 215 F/g in the scan rate of 20 mV/s.

Keywords:

Mxene , Ti3C2Tx , Polypyrrole , supercapacitor , composite