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dc.contributor.authorCorchado-García, Juan
dc.contributor.authorBetancourt, Luis E.
dc.contributor.authorVélez, Carlos A.
dc.contributor.authorSenanayake, Sanjaya D.
dc.contributor.authorStacchiola, Dario
dc.contributor.authorSasaki, Kotaro
dc.contributor.authorGuinel, Maxime J-F
dc.contributor.authorZhou, Yunyun
dc.contributor.authorCheung, Chin Li
dc.contributor.authorCabrera, Carlos R.
dc.identifier.citationPhysical Chemistry Chemical Physicsen_US
dc.description.abstractIn this study we probe the electrocatalytic activity of Pt nanoparticles supported on ceria nanoparticles (NP) and nanorods (NR) in the ethanol oxidation reaction (EOR) in alkaline media. The goal of the study was to relate morphology and support structure and composition to the EOR catalytic activity by using in-situ X-ray absorption fine structure (XAFS) studies. Cyclic Voltammetry experiments showed that both ceria supported catalysts (NP vs NR) had similar peak current densities at fast scan rates, however at slow scan rates, the ceria NR catalyst showed superior catalytic activity. In-situ XAFS studies in KOH showed that both ceria supported catalysts had more electron density in their d-band (with the ceria NR having more electron density overall) than the ceria - free Pt/Vulcan standard. However, in an ethanol solution the ceria NR catalyst had the least electron density. We propose that this change is due to the increased charge transfer efficiency between the ceria nanorod support and platinum. In the KOH solution, the increased electron density makes the platinum less electrophilic and hinders Pt-OH bond formation. In the EtOH solution, platinum’s increased nucleophilicity facilitates the bond formation between Pt and the electron deficient carbon in ethanol which in turn withdraws the electron density from platinum and increases the white line intensity as observed in the XAS measurements.en_US
dc.description.sponsorshipUse of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DEAC02-98CH10886.--NASA-MIRO Grant No.NNX10AQ17A.--NSF-NSEC Center for Hierarchical Manufacturing, Grant No. CHM-CMMI-0531171en_US
dc.publisherRoyal Society of Chemistryen_US
dc.subjectPt Nanoparticlesen_US
dc.subjectCeO2 Nanoparticlesen_US
dc.subjectX-Ray photoelectron spectroscopy (XPS)en_US
dc.subjectX- Ray absorption spectroscopy (XAFS)en_US
dc.subjectX-Ray diffraction (XRD)en_US
dc.titleCerium oxide as a promoter for the electro-oxidation reaction of ethanol: In-situ XAFS characterization of the Pt nanoparticles supported on CeO2 nanoparticles and nanorods.en_US
dc.description.FacultyCollege of Natural Sciencesen_US
dc.description.DepartmentDepartment of Chemistryen_US
dc.contributor.campusUniversity of Puerto Rico, Río Piedras Campus

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