Tetraethylammonium bromide is widely used in biochemical research as a potassium channel blocker. It helps in studying the function and regulation of potassium channels in various cell types. This compound is also employed in electrophysiology experiments to investigate the electrical properties of neurons and other excitable cells. Additionally, it serves as a phase-transfer catalyst in organic synthesis, facilitating reactions between compounds in different phases. In material science, it is utilized in the preparation of ionic liquids and as a template in the synthesis of certain types of zeolites. Its role in these applications underscores its versatility in both biological and chemical research.