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Electrocatalytic IrO 2 -RuO 2 supported on Sb-doped SnO 2 (ATO) nanoparticles is very active towards the oxygen evolution reaction. The IrO 2 -RuO 2 material is XRD amorphous and exists as clusters on the surface of the ATO.Systematic changes to the surface chemical composition of the ATO as a function of the IrO 2 :RuO 2 ratio suggests an interaction between the IrO 2 -RuO 2 and ATO. Cyclic voltammetry indicates that the electrochemically active surface area of IrO 2 -RuO 2 clusters is maximised when the composition is 75 mol% IrO 2 -25 mol% RuO 2 . Decreasing the loading of IrO 2 -RuO 2 on ATO reduces the electrochemically active surface area, although there is evidence to support a decrease in the clusters size with decreased loading. Tafel slope analysis shows that if the clusters are too small, the kinetics of the oxygen evolution reaction are reduced. Overall, clusters of IrO 2 -RuO 2 on ATO have similar or better performance for the oxygen evolution reaction than many previously reported materials, despite the low quantity of noble metals used in the electrocatalysts. This suggests that these oxides may be of economic

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