Tetraethylammonium tetrafluoroborate 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, enabling precise control over reaction conditions in electrochemical processes. The compound is also employed in the study of ion transport mechanisms in biological systems, helping researchers understand cellular processes. Additionally, it finds use in the fabrication of electrochromic devices, where it contributes to the efficient switching of optical properties. Its non-reactive nature and solubility in organic solvents make it a versatile choice in various industrial and research applications.