Tetramethylammonium is a quaternary ammonium compound with the chemical formula N(CH₃)₄⁺. It consists of a nitrogen atom bonded to four methyl groups, making it a positively charged ion. This compound is often used in various chemical reactions and as a phase transfer catalyst in organic synthesis. In addition to its applications in chemistry, tetramethylammonium is also utilized in the field of electrochemistry. It can serve as a supporting electrolyte in electrochemical cells, helping to improve conductivity and enhance the efficiency of reactions. Its unique properties make it valuable in both research and industrial settings.