Tetraethylammonium bromide is widely used in biochemical and pharmacological research as a potassium channel blocker. It helps in studying the function and regulation of potassium channels in various cell types, providing insights into cellular processes and potential therapeutic targets. In neuroscience, it is employed to investigate the role of potassium channels in neuronal excitability and signal transmission. Additionally, it serves as a phase-transfer catalyst in organic synthesis, facilitating reactions between compounds in different phases. Its application extends to electrochemistry, where it is used as an electrolyte additive to enhance conductivity and stability in electrochemical systems.