Influences from Solvents on Charge Storage in Titanium Carbide MXenes

Pseudocapacitive energy storage in supercapacitor electrodes differs significantly from the electrical double-layer mechanism of porous carbon materials, which requires a change from conventional thinking when choosing appropriate electrolytes. This chapter shows how how simply changing the solvent of an electrolyte system can drastically influence the pseudocapacitive charge storage of the two-dimensional titanium carbide, Ti3C2. Measurements of the charge stored by Ti3C2 in lithium-containing electrolytes with nitrile-, carbonate- and sulfoxide-based solvents show that the use of a carbonate solvent doubles the charge stored by Ti3C2 when compared with the other solvent systems. The chapter demonstrates that the choice of the electrolyte solvent plays a significant role in determining the Liion intercalation process for Ti3C2 MXene electrode in organic electrolytes.