The two-dimensional (2D) materials have become very popular as reliable electrode materials for energy storage. Their large specific surface areas offer a higher number of electrochemically active sites to store ions compared to that of bulk counterparts. This allows 2D electrodes to have enhanced capacities. Due to the reduced distance between those active sites in the nanosheets, fast charging and discharging rates can be achieved while good power densities can be also be obtained. MXene is a large family of 2D materials with a general chemical formula of M n+1 X n T x where M is an early transition metal atom, X represents C or/and N atom, and T indicates the surface termination . The most common surface terminations reported for MXenes are O, OH, F, and S. It is found that O and S terminated MXenes have better electrochemical properties for battery applications relative to the OH and F functionalized MXenes. The main advantage of M n+1 X n S x MXenes over M n+1 X n O x monolayers is that the former has lower diffusion barriers than the latter . It is reported that Ti 2 CS 2 monolayers exhibit significantly higher gravimetric capacity for Mg compared to that of Ti 2 CO 2 nanosheets .