Sx. Jin et Sy. Ye, OXYGEN EVOLUTION ON TITANIUM ANODES COATED WITH CONDUCTIVE METALLIC OXIDES - KINETICS AND MECHANISM IN ALKALINE-SOLUTION, Electrochimica acta, 41(6), 1996, pp. 827-834
Ti/SnO2 + CuCo2O4 and Ti/RuO2 + TiO2 anodes were used to study oxygen
evolution in alkaline solutions and to compare the kinetics on both el
ectrodes. On each electrode the existence of two Tafel regions was con
firmed. At low current density (ed) the Tafel slope is 39 mV decade(-1
), whereas at high ed it is 120 mV decade(-1). The reaction orders wit
h respect to the activity of OH-(a(OH-)), or the activity of water (a(
w)), or a(OH-)a(w), in two Tafel regions and in dilute and concentrate
d alkaline solutions, respectively, were obtained. According to the ob
tained kinetic data, the mechanisms of oxygen evolution on these types
of electrodes were proposed.