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Here we develop a class off face centred cubic structure of metallic silvernanocrystals, to enable high ORR activity process. Silver nanoparticlesdeposited within different carbon supports: carboxylated-graphene, SiO2-dotedreduced- graphene-oxide (Gr/SiO2) and reduced-graphene-oxide (Gr) wereprepared. The reduction of silver ions and the formation of silvernanoparticles deposited within graphene-type supports have been assessed byUV-Vis spectroscopy and was confirmed by XRD studies. The major advantage ofthe proposed chemical synthetic method is the integration of the superbproperties of both silver nanoparticles and graphene supports in a single-stepsynthesis with a 100% usage of the silver precursor (AgNO3). The choice of thecarbon support strongly affected catalytic activity of the resulting Agnanoparticles towards oxygen electroreduction in alkaline medium. We show thatSiO2-doted reduced- graphene-oxide supported silver nanoparticles displaysignificantly enhanced catalytic activity towards the oxygen reduction reaction(ORR) in alkaline solutions compared to the silver nanoparticles immobilizedwithin carboxylated-graphene support and chemically reduced graphene oxide(Gr). Moreover under RRDE conditions the hybrid material based on SiO2-dotedreduced- graphene-oxide supported silver nanoparticles displays the mostimpressive electrocatalytic performance toward ORR and shows the highest numberof exchanged electrons (n) ranging from 3.96 to 3.998 when compared to thesilver nanoparticles immobilized within carboxylated-graphene support(3.90-3.994) and reduced-graphene-oxide (Gr) supported silver nanoparticles(3.88-3.991).

Development of nanostructured-graphene-supported silver nanoparticles as catalysts for electroreduction of oxygen in alkaline electrolyte