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We report here on a novel and facile techniques for the synthesisnanocomposite based on stable bimetallic catalyst containing iridium and goldnanoparticles electrodeposited on chemically reduced graphene oxide (rGO) sheetadmixed with platinum nanoparticles as an efficient electrocatalyst tofacilitate the oxygen reduction reaction (ORR) in acidic medium. Ramanspectroscopy, infrared spectroscopy (IR), scanning electron microscope (SEM),transmission electron microscope (TEM) methods were employed to characterizethe rGO, Au-NPS-rGO, Ir-NPS-rGO, Au-Ir-rGO nanocomposites formed on theelectrode surface. Here we present a comparative study into the relativeeffects of each hybrid nanocomposites: Au-NPS-rGO, Ir-NPS-rGO, Au-Ir-rGOnanocomposites on the performance of platinum nanoparticles towards the oxygenreduction reaction (ORR) in acidic media. For the purposes of comparing thesupports, a simple platinum black catalyst is used and the performanceisevaluated via direct measurement of peroxide by rotating ring-disk electrode(RRDE) to determine the number of electrons (n) transferred in the ORR. It wasfound that platinum nanoparticles dispersed within Au-Ir-rGO support follows aquasi 4-electron mechanism (3.99-4 electrons involved) due to that the ORRtakes place mainly on the active Pt particles, and produced hydrogen peroxideis reduced at Au-Ir-rGO support.

Reduced-Graphene-Oxide with Dispersed Au-Ir Nanoparticles as Active Support for Pt at low Loadding for Electrocatalytic Oxygen Electroreduction