Ethylviologen dibromide is a specialty chemical primarily used in electrochemical applications due to its redox-active properties. It serves as an electron transfer mediator in various electrochemical systems, including sensors and biosensors, where it facilitates the detection of specific analytes. In research, it is employed to study electron transfer processes and mechanisms in both chemical and biological systems. Additionally, it is utilized in the development of electrochromic devices, where its ability to change color upon reduction or oxidation is exploited for smart windows or displays. Its role in energy storage systems, such as flow batteries, is also notable, as it helps enhance efficiency and stability in these devices. It can also act as a catalyst or mediator in certain chemical synthesis processes.