Abstract
AbstractRu‐modified Pt nanoparticle surfaces were prepared using Ru electrochemical or spontaneous deposition on commercial‐grade carbon‐supported Pt nanoparticles (Pt‐Vulcan XC72, E‐TEK). Evidence for CO mobility was provided by cyclic voltammetry and FTIR reflectance spectroscopy experiments in weakly specifically adsorbing electrolyte such as 0.1 M HClO4. Since the diffusion of CO is slow, a “two peak” voltammetric behavior was observed for 0 < θRu < 10%. A further increase in Ru coverage leads to the observation of only one CO oxidation peak at a potential ca. 150 mV less positive. FTIR reflectance spectra recorded on Ru‐modified Pt nanoparticles show a band located around 2000–2020 cm–1, which is attributed to adsorbed CO on Ru sites. Exchange between CO species adsorbed on Ru and Pt sites was also observed along with a complete oxidation of a pre‐adsorbed CO monolayer at a potential relevant for DMFC applications. These results confirm that the formation of a PtRu alloy is not a pre‐requisite for obtaining CO‐tolerant electrocatalysts.
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