Abstract
Abstract The influence of an underpotentially deposited adlayer of copper on the oxygen reduction reaction (ORR) at Au(111) has been studied in a 0.05 M H2SO4 solution using hanging meniscus rotating disk voltammetry. The total inhibition of the ORR was found after the formation of the first Cu adlayer. Two possible structures for the Cu adlayer on Au(111) take into account inhibition of the ORR. The total inhibition observed in the present study can be explained by a honeycomb (√3 × √3)R30° structure, rather than a simple (√3 × √3)R30° Cu adlayer. A bridging two-site process (disproportionation reaction) is not expected to occur on the honeycomb Cu adlayer.
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