Mechanism of oxygen reactions at porous oxide electrodes. Part 2--Oxygen evolution at RuO2, IrO2 and Ir(x)Ru(1-x)O2 electrodes in aqueous acid and alkaline solution.

The kinetics and mechanism of the oxygen evolution reaction at a series of RuO(2)/IrO(2) mixed oxides in aqueous acid and alkaline solution has been examined using a variety of electrochemical methods. Factors affecting the electrocatalytic activity have been elucidated and novel oxygen evolution mechanisms in terms of reactive oxyruthenium and oxyiridium surface groups are proposed.