Abstract: By determination of the polarization curves and the current efficiency, the electrolytic conditions and the reaction mechanism of the anodic oxidation of Br^- at a PbO₂ electrode were explored. It is indicated that the electrooxidation of Br^- is a first order reaction and the apparent activation energy is 8.53—8.81 kJ/mol in the potential range of 1.16—1.26 V. The current efficiency of Br^- oxidation at a PbO₂ electrode does not change basically with the change of pH values in the pH range of 2.0—10.2, decreases slightly with increasing temperature, and increases with increasing the concentration of bromide anion, but when the concentration of bromide anion increases up to a certain extent, the current efficiency keeps fixed.

Key words: Bromide anion, Electrooxidation, PbO₂, Anodic oxidation