Enhanced Electrochemical Performance of MWCNT-Assisted Molybdenum-Titanium Carbide MXene as a Potential Electrode Material for Energy Storage Application.

Two-dimensional (2D) materials such as MXenes have attracted considerable attention owing to their enormous potential for structural flexibility. Here, we prepared a MoTiCT-layered structure from parent MoTiAlCT MAX by chemically selective etching of the aluminum layer. The prepared MXene was employed in composite formation with CTAB-grafted multiwalled carbon nanotubes (MWCNTs) to have a structure with improved electrochemical performance. The samples were characterized to analyze the structure, morphology, elemental detection, vibrational modes, and surface chemistry, followed by an electrochemical performance of the MoTiCT MXene and MWCNTs@MoTiCT composite using the GAMRAY Potentiostat under a 1 M KOH electrolyte. The specific capacitance of pristine MoTiCT was 425 F g, which was enhanced to 1740 F g (almost 4 times) at 5 mV s due to the increase in active surface area and conductive paths between the MXene sheets. The charge storage mechanism was studied by further resolving the cyclic voltammograms. MWCNTs@MoTiCT showed much improved electrochemical performance and reaction kinetics, making it an ideal material candidate for supercapacitor applications.