Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/49953
Campo DC Valoridioma
dc.contributor.authorDoña, J. M.en_US
dc.contributor.authorGonzález-Velasco, J.en_US
dc.date.accessioned2018-11-24T12:04:41Z-
dc.date.available2018-11-24T12:04:41Z-
dc.date.issued1993en_US
dc.identifier.issn0022-3654en_US
dc.identifier.urihttp://hdl.handle.net/10553/49953-
dc.description.abstractTempera ture, potential, and time-dependent measurements of the change of the roughness factor of electrodispersed gold electrodes allowed a derivation of the activation enthalpy and entropy values for the surface diffusion process of gold adatoms in contact with a 0.5 M H2SO4 aqueous solution. The measurements were carried out at five different potential values, negative and positive with respect to the zero charge potential of polycrystalline gold (Ez = -0.41 VMsE) and a potential value within the potential range at which gold oxides are formed. The low preexponential factors deduced from In D vs T-1 plots give rise to negative values for the activation entropies, instead of the expected positive value for the same magnitude derived from measurements made at the goldvacuum interface. The activation enthalpy values measured in the potential range between 0 and 1000 mV SHE decrease with the potential value, while the activation entropies increase with them, showing an example of the so-called compensation effect. These values are interpreted as the consequence of the formation of an activated complex for the surface diffusion process that is more ordered than the system: electrode surface + adatom original. The enhancement of order might be produced by the fact that before surface diffusion can take place, a partial charge transfer from the adatom to the electrode surface occurs which accumulates a positive charge on the adatom original, with the consequent orientating effect on the solvent dipoles forming part of the double !ayer.en_US
dc.languageengen_US
dc.publisher0022-3654-
dc.relation.ispartofJournal of Physical Chemistryen_US
dc.sourceJournal of Physical Chemistry [ISSN 0022-3654], v. 97, p. 4714-4719en_US
dc.subject221005 Electroquímicaen_US
dc.titleMechanism of surface diffusion of gold adatoms in contact with an electrolytic solutionen_US
dc.typeinfo:eu-repo/semantics/articleen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/j100120a026en_US
dc.identifier.scopus0010062253-
dc.contributor.authorscopusid6701567121-
dc.contributor.authorscopusid7006777855-
dc.description.lastpage4719-
dc.description.firstpage4714-
dc.relation.volume97-
dc.investigacionCienciasen_US
dc.type2Artículoen_US
dc.utils.revisionen_US
dc.identifier.ulpgces
item.grantfulltextnone-
item.fulltextSin texto completo-
crisitem.author.deptGIR IUNAT: Fotocatálisis y espectroscopía para aplicaciones medioambientales.-
crisitem.author.deptIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.deptDepartamento de Química-
crisitem.author.orcid0000-0003-3604-1544-
crisitem.author.parentorgIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.fullNameDoña Rodríguez, José Miguel-
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