Electrochemical stability of carbon-supported gold nanoparticles in acidic electrolyte during cyclic voltammetry

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dc.contributor.authorSteven, JTen_AU
dc.contributor.authorGolovko, VBen_AU
dc.contributor.authorJohannessen, Ben_AU
dc.contributor.authorMarshall, ATen_AU
dc.date.accessioned2025-12-05T03:49:39Zen_AU
dc.date.available2025-12-05T03:49:39Zen_AU
dc.date.issued2016-01-01en_AU
dc.date.statistics2025-04-30en_AU
dc.description.abstractCyclic voltammetry has been used to assess the electrochemical stability of gold nanoparticle-based electrocatalysts with differing initial particle size distributions in sulphuric acid electrolyte. The electrochemically active surface area (EASA), based on the gold oxide reduction charge, revealed that the electrocatalyst containing gold nanoparticles with an initial number-weighted average diameter of 4.5 nm was stable over 100 voltammetry cycles. Conversely, the electrocatalysts based on 3.1 nm and 2.9 nm gold nanoparticles showed a continuous decrease in the EASA in line with TEM and EXAFS data which confirmed growth of the gold particles during cycling. Importantly, we find no evidence to suggest that the nature of the stabilising ligand used during the gold nanoparticle synthesis, has any effect of the electrochemical stability of gold nanoparticles. When the anodic limit of the cyclic voltammograms was limited to below the gold oxide formation potential, the nanoparticles were stable, confirming that the loss in EASA is primarily related to the dissolution and growth of gold nanoparticles associated with the Au-AuOx redox process. Interestingly, an electrocatalyst initially containing 0.8 nm diameter gold nanoclusters had a surprisingly low EASA (these clusters appear not to exhibit normal Au-AuOx redox behaviour typical for the larger gold nanoparticles), but still showed significant particle growth during the cycling as confirmed by TEM and XPS analysis. © 2015 Elsevier Ltd.en_AU
dc.description.sponsorshipThis work was supported in part by the Royal Society of New Zealand Marsden Grant No. UOC1202. This research was in part undertaken on the XAS beamline at the Australian Synchrotron, Victoria, Australia. We thank Prof Milo Kral for kind help with access to TEM facilities, Alistair Duff for help with AAS and Dr Colin Doyle for access to and help with XPS facilities at the University of Auckland.en_AU
dc.identifier.citationSteven, J. T., Golovko, V. B., Johannessen, B., & Marshall, A. T. (2016). Electrochemical stability of carbon-supported gold nanoparticles in acidic electrolyte during cyclic voltammetry. Electrochimica Acta, 187, 593-604. doi:10.1016/j.electacta.2015.11.096en_AU
dc.identifier.issn0013-4686en_AU
dc.identifier.journaltitleElectrochimica Actaen_AU
dc.identifier.pagination593-604en_AU
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2015.11.096en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16767en_AU
dc.identifier.volume187en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectElectrochemistryen_AU
dc.subjectCarbonen_AU
dc.subjectGolden_AU
dc.subjectNanoparticlesen_AU
dc.subjectElectrolytesen_AU
dc.subjectElectrocatalystsen_AU
dc.subjectSynthesisen_AU
dc.subjectLigandsen_AU
dc.subjectRedox potentialen_AU
dc.titleElectrochemical stability of carbon-supported gold nanoparticles in acidic electrolyte during cyclic voltammetryen_AU
dc.typeJournal Articleen_AU
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