Ti3C2Tx MXene-based (Cobalt-Vanadium) bimetallic sulfides 0D@2D heterostructure composite for asymmetric supercapacitor application

2D MXenes are receiving a significant attention in the energy-storage sector, owing to their high surface redox reactivity, hydrophilicity, multi-layered sheet structure, and high conductivity. However, MXenes are subjected to sheets restacking which decrease the number of surface-active sites, and thus limits their capacity value. In this work, CoVS2 NPs are in-situ grown over the Ti3C2Tx nanosheets using a facile hydrothermal technique. The insertion of the nanoparticles can reduce the restacking of the sheets and creating abundant active sites. As a cathode material for the (ASCs) application, the CoVS2@MXene hybrid electrode achieves a high specific capacity value of 423 mAh g(-1) at 1 A g(-1), with an outstanding cycling stability of more than 93 % capacity retention after 5000 working cycles. Moreover, the obtained CoVS2@MXene//VS2@MXene ASC device provides a significant energy density of similar to 57.78 W h kg(-1) at 832 W kg(-1) power density, and 90.3 % capacity retention. Such results indicate that the CoVS2@MXene hybrid material offers excellent potential for future development of a new MXene-based supercapacitor devices.