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

doi:10.15541/jim20140425

Abstract

Abstract:

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 Clˉ 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 Clˉ 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.

Key words: specific adsorption, Ru-La-O oxides, chlorine evolution reaction, Volmer-Tafel mechanism, RuO₂

CLC Number:

TQ174

LONG Ping, XU Li-Kun, CUI Xiu-Fang, JIN Guo. Comparative Study on Kinetics of Chlorine Evolution Reaction for Ru-La-O Oxide Coatings[J]. Journal of Inorganic Materials, 2015, 30(5): 493-499.

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