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dc.contributor.authorMinguzzi, Alessandro
dc.contributor.authorMontagna, Linda
dc.contributor.authorFalqui, Andrea
dc.contributor.authorVertova, Alberto
dc.contributor.authorRondinini, Sandra
dc.contributor.authorGhigna, Paolo
dc.date.accessioned2018-03-20T12:34:07Z
dc.date.available2018-03-20T12:34:07Z
dc.date.issued2018-03-17
dc.identifier.citationMinguzzi A, Montagna L, Falqui A, Vertova A, Rondinini S, et al. (2018) Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy. Electrochimica Acta. Available: http://dx.doi.org/10.1016/j.electacta.2018.03.092.
dc.identifier.issn0013-4686
dc.identifier.doi10.1016/j.electacta.2018.03.092
dc.identifier.urihttp://hdl.handle.net/10754/627363
dc.description.abstractIn this work we studied the kinetics of oxide formation and reduction on Pt nanoparticles in HClO4 in the absence and in the presence of Br− and Cl− ions. The study combines potential step methods (i.e. chronoamperometry and choronocoulometry) with energy dispersive X-ray absorption spectroscopy (ED-XAS), which in principle allows to record a complete XAS spectrum in the timescale of milliseconds. Here, the information on the charge state and on the atomic surrounding of the considered element provided by XAS was exploited to monitor the degree of occupancy of 5d states of Pt in the course of oxide formation and growth, and to elucidate the competing halide adsorption/desorption phenomena. Electrochemical methods and XAS agree on the validity of a log(t) depending growth of Pt oxide, that is significantly delayed in the presence of Cl− and Br− anions. In the proximity of formation of one monolayer, the growth is further slowed down.
dc.description.sponsorshipWe are grateful to Industrie De Nora S.p.A. for having supplied Pt nanoparticles deposited on carbon. The ESRF is kindly acknowledged for the provision of beamtime (Exp. CH-4951). We are grateful to Dr. Sara Morandi for her considerable help during data collection. We also acknowledge the ID24 beamline staff, and, in particular, Dr. Debora Motta Meira, for considerable help during data collection and analysis.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0013468618305942
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electrochimica Acta, [, , (2018-03-17)] DOI: 10.1016/j.electacta.2018.03.092 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectTime resolved XAS
dc.subjectSpectroelectrochemistry
dc.subjectPlatinum oxidation
dc.subjectSpecific adsorption
dc.subjectChlorides
dc.subjectBromides
dc.titleDynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentBioscience Program
dc.identifier.journalElectrochimica Acta
dc.eprint.versionPost-print
dc.contributor.institutionConsorzio Interuniversitario di Scienze e Tecnologia Dei Materiali, Via San Giusti 9, 50121, Firenze, Italy
dc.contributor.institutionDipartimento di Chimica, Università Degli Studi di Milano, Via Golgi 19, 20133, Milano, Italy
dc.contributor.institutionDipartimento di Chimica, Università Degli Studi di Pavia, Viale Taramelli 13, 27100, Pavia, Italy
kaust.personFalqui, Andrea
refterms.dateFOA2020-03-17T00:00:00Z
dc.date.published-online2018-03-17
dc.date.published-print2018-04


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