Abstract
A series of ternary oxides of nominal composition Ru 0.3Ti (0.7 − x) Ce x O 2 was prepared by thermal decomposition on Ti supports and used as electrodes to study the effect of substituting Ce for Ti on the kinetics and electrocatalysis of the Cl 2 evolution reaction. The surface properties were evaluated by cyclic voltammetry. Integration of the voltammetric curves provided the voltammetric charge, q ∗ , which is proportional to the active surface area. Kinetic data showed that Cl 2 evolution occurs with a single mechanism over the whole explored potential range and at all electrode compositions. Fractional reaction orders with respect to both Cl − and H + revealed double-layer effects attributed to the occurrence of Cl − specific adsorption. The apparent activity increased with CeO 2 content, whereas the true electrocatalytic properties, estimated by normalizing the current to unit surface charge, decreased in the presence of CeO 2 with a minimum of 10% CeO 2. The presence of CeO 2 also makes the oxide layers more prone to mechanical erosion by the evolving gas bubbles.
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