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Evaluation of reduced-graphene-oxide-supported gold nanoparticles as catalytic system for electroreduction of oxygen in alkaline electrolyte

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cris.lastimport.scopus2024-02-12T20:49:10Z
dc.abstract.enChemically-reduced graphene-oxide-supported gold nanoparticles with a diameter, of 40–60 nm are considered here as catalytic materials for the reduction of oxygen in alkaline medium in comparison to analogous systems based on conventional Vulcan carbon carriers. Gold nanoparticles are prepared by the chemical reduction method, in which the NaBH4-prereduced Keggin-type phosphomolybdate heteropolyblue acts as the reducing agent for the precursor (HAuCl4). Polyoxometallate (PMo12O403−) capping ligands stabilize gold nanoparticle deposits, facilitate their dispersion and attachment to carbon supports. Indeed, it is apparent from the independent diagnostic voltammetric experiments (in 0.5 mol dm−3 H2SO4) that heteropolymolybdates form readily stable adsorbates on nanostructures of both gold and carbon (reduced graphene oxide and Vulcan). It is reasonable to expect that the polyoxometallate-assisted nucleation of gold has occurred in the proximity of oxygenated defects existing on carbon substrates. Under conditions of electrochemical diagnostic experiments (performed in 0.1 mol dm−3 KOH): (i) the phosphomolybdate adsorbates are removed from the interface as they undergo dissolution in alkaline medium; and (ii) the Au nanoparticles (Au loading, 30 μg cm−2) remain well-dispersed on the carbon as evident from transmission electron microscopy. High electrocatalytic activity of the reduced-graphene oxide-supported Au nanoparticles toward reduction of oxygen in alkaline medium is demonstrated using cyclic and rotating ring-disk voltammetric experiments. The latter system could also act as the active support for Pt nanoparticles during the reduction of oxygen. Among important issues are possible activating interactions between gold and the support, as well as presence of structural defects existing on poorly organized graphitic structure of reduced graphene oxide (as evident from Raman spectroscopy).
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBlicharska, Magdalena
dc.contributor.authorNegro, Enrico
dc.contributor.authorNoto, Vito Di
dc.contributor.authorMiecznikowski, Krzysztof
dc.contributor.authorRutkowska, Iwona
dc.contributor.authorKulesza, Paweł
dc.contributor.authorŻołądek, Sylwia
dc.contributor.authorOzimek, Weronika
dc.contributor.authorOrłowska, Justyna
dc.date.accessioned2024-01-24T23:38:21Z
dc.date.available2024-01-24T23:38:21Z
dc.date.issued2017
dc.description.financeNie dotyczy
dc.description.volume233
dc.identifier.doi10.1016/J.ELECTACTA.2017.03.002
dc.identifier.issn0013-4686
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106555
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofElectrochimica Acta
dc.relation.pages113-122
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enGold nanoparticles
dc.subject.enOxygen reduction
dc.subject.enPolyoxometallate adsorbates
dc.subject.enChemically reduced graphene oxide
dc.subject.enVulcan carbon black
dc.titleEvaluation of reduced-graphene-oxide-supported gold nanoparticles as catalytic system for electroreduction of oxygen in alkaline electrolyte
dc.typeJournalArticle
dspace.entity.typePublication