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 Mo 2 TiC 2 T x -layered structure from parent Mo 2 TiAlC 2 T x 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 Mo 2 TiC 2 T x MXene and MWCNTs@Mo 2 TiC 2 T x composite using the GAMRAY Potentiostat under a 1 M KOH electrolyte. The specific capacitance of pristine Mo 2 TiC 2 T x was 425 F g -1 , which was enhanced to 1740 F g -1 (almost 4 times) at 5 mV s -1 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@Mo 2 TiC 2 T x showed much improved electrochemical performance and reaction kinetics, making it an ideal material candidate for supercapacitor applications.