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Comparative Study on Kinetics of Chlorine Evolution Reaction for Ru-La-O Oxide Coatings

The Ti/RuO2 and Ti/Ru-La-O oxide coatings were prepared by thermal decomposition of the metal chlorides in the precursor solution. The specific adsorption of Cl on coatings, the effect of La on the chlorine evolution reactions (ClER) and the kinetic mechanism were investigated by using differential capacity (DC) and polarization curves (PC). Results show that the coating surface exhibits significantly specific adsorption of Cl in NaCl neutral solution, which has an influence on the kinetics of the chlorine evolution process, resulting in an increase of the Tafel slope and a decrease of the reaction order. The addition of lanthanum reduces the overpotential of Ti/RuO2 coating and enhances the exchange current density, which improves the chlorine evolution reaction of the coatings. Both kinetic mechanisms of recombination and electrochemical desorption of adsorbed intermediate species for the coatings are comparatively studied. It is confirmed that the Chlorine evolution reaction on Ru-La-O oxide coatings in NaCl neutral solution is controlled by the process of rds 2 2 S OCl * 2 S O Cl o ⋅  o ⋅ + .