Effect of Composition on the Electrocatalytic Activity of the Ternary Oxide Ru0.3Ti ( 0.7 − x ) Sn x O 2 : I . Oxygen Evolution from Solutions

The electrocatalytic activity of ternary oxides of general formula for evolution from 1 mol dm −3 solution has been studied as a function of by current‐potential curves and reaction order determination. The surface state of the electrodes has been monitored by voltammetric curves before and after each run of experiments. The mechanism of evolution has been found not to depend on oxide composition, whereas the electrocatalytic activity has been observed to rise as the content increases. The surface charge drops dramatically after extensive evolution, thus indicating collapse of the surface morphology. The open‐circuit potential and the shape of the voltammetric curves have also been used as diagnostic parameters. The present results show that activates electrodes, consequently decreasing their stability.