Electrochemistry of Br-/Br2 Redox Couple in Acetonitrile, Methanol and Mix Media of Acetonitrile-Methanol: An Insight into Redox Behavior of Bromide on Platinum (Pt) and Gold (Au) Electrode

Electro- oxidation of Br- on platinum and gold electrode was studied in acetonitrile, methanol and mix media of acetonitrile-methanol. The mechanism of Br- oxidation in these media was investigated using CV, Semi Integration Cyclic Voltammetry, and Digital Simulation technique. Since, Br- oxidation mechanism on platinum involves the formation of Br-3(-) as intermediate, therefore, K-stab for Br-3(-) formation in the mixed media was estimated using digital simulation, Nelson and Iwamoto method. Redox mechanism of Br- and Br-2 on gold (Au) electrode was also investigated in protic solvent such as H2O, methanol, ethanol, 1-butanol, and formic acid. It was ascertained that Br- oxidation on gold (Au) electrode in these above protic solvents involve [AuBr2](-) intermediate rather than Br-3(-).