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Abstract
In this article, we characterized tungsten oxide-decorated carbon-supported PtIr nanoparticles and tested it for the electrooxidation reactions of ethylene glycol and ethanol. Phase and morphological evaluation of the proposed electrocatalytic materials are investigated employing various characterization techniques including X-ray diffraction (XRD) and transmission electron microscopy (TEM). Electrochemical diagnostic measurements such as cyclic voltammetry, chronoamperometry, and linear sweep voltammetry revealed that the tungsten oxide-modified PtIr/Vulcan nanoparticles have higher catalytic activity for ethylene glycol and ethanol electrooxidation than that of PtIr/Vulcan. A significant enhancement for electrooxidation of CO-adsorbate monolayers occurred in the presence of a transition metal oxide relative to that of pure PtIr/Vulcan electrocatalyst. The likely reasons for this are modification on the Pt center electronic structure and/or increasing the population of reactive oxo groups at the PtIr/Vulcan electrocatalytic interface in different potential regions.
Highlights
An important task in the twenty-first century is to further develop fuel cells as alternative electrochemical devices forM
The results indicate that Pt fcc is the main crystalline phase in the catalysts and that the presence of tungsten species resulted in the formation of crystalline aggregates
We demonstrate the enhancement of the activity of catalysts composed of bimetallic PtIr nanoparticles and tungsten oxide toward electrooxidation of ethylene glycol and ethanol
Summary
An important task in the twenty-first century is to further develop fuel cells as alternative electrochemical devices forM. Cyclic voltammetric curves of the PtIr/Vulcan and the WO3-modified PtIr/Vulcan nanoparticles deposited on glassy carbon electrode were obtained in 0.5 mol dm−3 sulfuric acidsupporting electrolyte (Fig. 3). The cyclic voltammograms of ethanol (Fig. 4a) and ethylene glycol (Fig. 4b) obtained at the PtIr/Vulcan and WO3-modified PtIr/Vulcan surface, respectively, show well-defined peaks for both forward and reverse scans in the investigated potential region.
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