Glycerol Electrooxidation On Platinum-tin Electrodeposited Films: Inducing Changes In Surface Composition By Cyclic Voltammetry

dc.creatorMello
dc.creatorGisele A. B.; Fernandez
dc.creatorPablo S.; Martins
dc.creatorMaria E.; Camara
dc.creatorGiuseppe A.
dc.date2017
dc.datejan
dc.date2017-11-13T13:25:02Z
dc.date2017-11-13T13:25:02Z
dc.date.accessioned2018-03-29T05:57:31Z
dc.date.available2018-03-29T05:57:31Z
dc.identifierElectrocatalysis. Springer, v. 8, p. 1 - 10, 2017.
dc.identifier1868-2529
dc.identifier1868-5994
dc.identifierWOS:000390032500001
dc.identifier10.1007/s12678-016-0332-z
dc.identifierhttps://link.springer.com/article/10.1007/s12678-016-0332-z
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/328431
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1365456
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionIn this work, PtSn binary electrodeposits were prepared in three compositions and submitted to successive voltammetric cycles in presence of glycerol (1.0 mol L-1) in acidic media. Catalysts were characterized by energy dispersive X-ray analysis and X-ray photoelectron spectroscopy before and after the cycles being performed, in order to check eventual changes in their compositions during the process. Spectroscopic results show that surface compositions are sensibly richer in Sn than their bulk counterparts. Overall, PtSn catalysts show a poor initial catalytic activity toward glycerol electrooxidation. However, as the cycles succeed, the voltammetric responses increasingly resemble that of Pt, while the oxidation currents increase. Results are rationalized in terms of a continuous enrichment of the surface by Pt at the expenses of a loss of Sn. Moreover, when the electrochemical surface area (ECSA) is estimated by stripping of CO, it becomes evident that electrooxidation currents remain growing, even when the ECSA is decreased, which makes the gain in catalytic activity particularly relevant. Ultimately, from a broader perspective, our results suggest that catalytic surfaces with tunable features (such as surface composition and catalytic response) can be obtained by the application of easily executable electrochemical protocols.
dc.description8
dc.description1
dc.description1
dc.description10
dc.descriptionCNPq [405695/2013-6, 309176/2015-8]
dc.descriptionFUNDECT
dc.descriptionCAPES
dc.descriptionMINCyT
dc.descriptionFINEP
dc.descriptionCONICET
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageEnglish
dc.publisherSpringer
dc.publisherNew York
dc.relationElectrocatalysis
dc.rightsfechado
dc.sourceWOS
dc.subjectGlycerol Electrooxidation
dc.subjectPlatinum-tin
dc.subjectElectrodeposits
dc.subjectTunable Composition
dc.subjectSurface Composition Change
dc.titleGlycerol Electrooxidation On Platinum-tin Electrodeposited Films: Inducing Changes In Surface Composition By Cyclic Voltammetry
dc.typeArtículos de revistas


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