Abstract: The kinetics of the chlorine evolution reaction on Ti/β-PbO₂ electrode has been studiedbased on the current-potential curves using a rotating disc electrode. The reaction rate affect-ing factors, such as Cl^- ion concentration and pH of the solution, have been examined, thebydrogen ions were found to promote the chlorine evolution reaction. This has been ascribedto the competitive adsorption between H₂O molecules and chloride ions at the active sites ofthe electrode surface. The following parameters were determined: the anodic transfer coeffi-cient, Tafel slope, and the reaction orders with respect to Cl^- and H⁺. From the experimental results the rate determining step of the anodic evolotion of chlorine on Ti/β-PbO₂ electrode is found to be MCl_ads^-——MCl_adi+e

Key words: Ti-supported lead dioxide electrode, chlorine evolution reaction kinetics,mechanism