Tetraethylammonium fluoride hydrate is primarily used as a fluorinating agent in organic synthesis. It is particularly effective in nucleophilic fluorination reactions, where it introduces fluorine atoms into organic molecules. This is crucial in the production of pharmaceuticals, agrochemicals, and other fine chemicals, as the addition of fluorine can significantly alter the biological activity, stability, and metabolic properties of a compound.

In addition, it serves as a catalyst or reagent in various chemical transformations, such as the synthesis of fluorinated aromatic compounds and heterocycles. Its role in facilitating these reactions makes it valuable in the development of new materials and active ingredients for drugs.

The compound is also utilized in electrochemical applications, where it acts as an electrolyte additive in batteries and supercapacitors, enhancing their performance and stability. Its ionic properties contribute to improved conductivity and efficiency in these systems.

Overall, Tetraethylammonium fluoride hydrate is a versatile chemical with significant applications in organic synthesis, material science, and energy storage technologies.