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| - Effect of the Iridium Oxide Thin Film on theElectrochemical Activity of Platinum Nanoparticles
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| - The influence of the iridium oxide thin film on the electrocatalytic properties of platinum nanoparticleswas investigated using the electro-oxidation of methanol and CO as a probe. The presence of the IrO2 thinfilm leads to the homogeneous dispersion of Pt nanoparticles. For comparison, polycrystalline platinumand Pt nanoparticles dispersed on a Ti substrate in the absence of an IrO2 layer (Ti/Pt) were also investigatedin this study. Inverted and enhanced CO bipolar peaks were observed using an in situ electrochemicalFourier transform infrared technique during the methanol oxidation on the Pt nanoparticles dispersedon a Ti substrate. Electrochemical impedance studies showed that the charge transfer resistance wassignificantly lower for the Ti/IrO2/Pt electrode compared with that of the massive Pt and Ti/Pt nanoparticles.The presence of the IrO2 thin film not only greatly increases the active surface area but also promotes COoxidation at a much lower electrode potential, thus, significantly enhancing the electrocatalytic activityof Pt nanoparticles toward methanol electro-oxidation.
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