Elucidating the Energy Storage Performance of 2D Metallic Vanadium Ditelluride/Carbon Nanotube for Next‐Generation Asymmetric Supercapacitors Using Emerging MoSSe/Carbon Nanotube

Abstract

Recently, vanadium ditelluride (VTe2) a member of the transition metal ditellurdies family has emerged as a functional material for energy storage applications owing to its exotic intrinsic properties. Similar to most of the nanostructured materials, a hybrid structure of VTe2 is expected to provide enhanced energy storage capability. Herein, two hybrid structures of VTe2 are engineered using well‐explored nanocarbons such as RGO and carbon nanotube (CNT) to create a compelling supercapacitor electrode material. Both the hybrid structures show improved electrochemical activity, but VTe2/CNT fared better in the charge storage efficiency. The enhanced active sites, short ionic/electronic pathways provided by the CNT network, and the large electric double‐layer contribution have synergized for the inflated capacitance of VTe2/CNT. Further, a high‐performance asymmetric supercapacitor (ASC) of VTe2/CNT//MoSSe/CNT is constructed in a typical Swagelok cell, and the ASC delivered an energy density output of 36.28 Wh kg−1 at a power density of 463.16 W kg−1 with a remarkable 80.26% capacitance retention. The results of this work suggest that VTe2/CNT is a promising contender in the pantheon of functional materials for energy storage applications in the near future.

Keywords

• nanocarbon
• pseudocapacitance
• supercapacitors
• TMDs
• VTe2