Tetraethylammonium trifluoromethanesulfonate is widely used as an electrolyte in electrochemical applications, particularly in supercapacitors and batteries, due to its high ionic conductivity and stability. It serves as a supporting electrolyte in organic synthesis, facilitating reactions like electrochemical fluorination and polymerization. In the field of materials science, it is employed in the preparation of ionic liquids and as a dopant in conductive polymers. Additionally, it is utilized in analytical chemistry as a phase-transfer catalyst, enhancing the efficiency of reactions involving immiscible reactants. Its properties also make it suitable for use in electroplating and corrosion inhibition studies.