Abstract
Using simultaneous imaging and structural fingerprinting under reaction conditions, we probe the initial oxidation pathway and CO oxidation catalysis on Ru(0001). Oxidation beyond an initial $(1\ifmmode\times\else\texttimes\fi{}1)\text{-O}$ adlayer phase produces a heterogeneous surface, comprising a disordered trilayerlike surface oxide and an ordered ${\text{RuO}}_{2}(110)$ thin-film oxide, which form independently and exhibit similar stability. The surface oxide and ${\text{RuO}}_{2}$ phases both show high intrinsic catalytic activity. The oxygen adlayer is inactive in isolation but becomes active due to cooperative effects in close proximity to the surface oxide.
Published Version
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