Abstract
The authors report a general methodology for probing the depth profile of alloying extent and composition in bimetallic nanoparticles (NPs) by a combined in situ x-ray absorption spectroscopy (XAS) and electrochemical strategy. The XAS results of Pt-richcore–Ru-richshell NPs during methanol electro-oxidation revealed that the alloying extent of Pt (JPt) and Ru (JRu) is higher in the core region compared to those in the shell region. An average decrease in the JPt and JRu is observed when the cluster undergoes reduction. By controlling the cluster oxidation degree it is possible to probe the depth profile of the alloying extent in bimetallic NPs.
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