Tetrabutylammonium perchlorate is commonly used as a supporting electrolyte in electrochemical studies due to its high solubility in organic solvents and its ability to provide a stable ionic environment. It is particularly useful in non-aqueous systems for investigating redox reactions, cyclic voltammetry, and other electrochemical processes. Additionally, it serves as a phase-transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases, which enhances reaction rates and yields. Its application extends to the preparation of ionic liquids and as a reagent in the synthesis of various organic compounds.