Kinetics and mechanism of chlorine evolution on metaloxide electrodes

The mechanisms and the data of kinetic parameters given in literature for the chlorine evolution on various types of Ru02/Ti02 electrodes are discussed. Moreover, some new experimental results are given. It has been concluded that the chlorine evolution on this type of electrode occurs according to the Volmer— Heyrowsky mechanism, where the Volmer reaction is in quasi equilibrium and the Heyrowsky reaction and eventually the diffusion of molecular chlorine away from the electrode surface into the bulk of the solution determine the potential— current density relation