Synthesis of Ti_2CT_x MXene as electrode materials for symmetric supercapacitor with capable volumetric capacitance

Two-dimensional(2D)metal carbides,MXene,present the promising application for the energy storage system.Among the MXene family,Ti_2CT_xas the lightest material,shows its unique electrochemical performance.Herein,Ti_2CT_xis synthesized by selective etching Al layer from the Ti_2Al C.With the optimized HF treating condition,Ti_2CT_xdisplays high volumetric capacitance and remarkable rate ability.Moreover,the Ti_2CT_x//Ti_2CT_xsymmetric supercapacitor is designed and assembled,which presents capable capacitance,outstanding rate performance and excellent cycling performance.The remarkable electrochemical performance is attributed to its 2D structure and high electronic conductivity.This work demonstrates the potential application of the Ti_2CT_xfor the supercapacitors and provides a template to design highperformance supercapacitors with 2D electrode materials.