Paper Title
Decoration of Ti3C2Tx MXene Layers by Tellurium for Energy Storage Devices

Abstract
2D transition metal carbides and nitrides (MXenes) have demonstrated promising nanomaterials in a variety of energy storage and conversion applications. However, it is still desirable to develop MXene properties with specific functional groups of inorganic and/or organic materials. In this work, for the first time conjugation effect of pre-selected tellurium (Te) chalcogen elementon multilayered Ti3C2TxMXene was investigated for supercapacitor application. The electrochemical capacitance of the synthesized pristine Ti3C2Tx and Te/Ti3C2Tx have been assessed basis on assembled symmetric supercapacitors with 1 M Na2SO4 neutral electrolyte. The Te/Ti3C2Txsupercapacitor exhibited a high specific capacitance of 150 F g-1, which is greater than the blanksynthesized Ti3C2Tx (64 F g-1).Moreover, a high areal capacitance (745 mF cm-2), very good energy density (67Wh Kg-1) and power density (153 W kg-1), as well as cycling stability (~ 90% capacitance retention over 800 cycles) were obtained for the Te/Ti3C2Txsupercapacitor. These enhancements could be attributed to the larger specific surface area, the reduction of fluorine content, and the charge polarization imposed by the fabricated composites.