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Oxidation of formaldehyde and ethanol on Au(1 1 1) and Au(1 1 1) modified by spontaneously deposited Ru in sulfuric acid solution
dc.creator | Štrbac, Svetlana | |
dc.creator | Avramov Ivić, Milka | |
dc.date.accessioned | 2019-01-30T17:21:07Z | |
dc.date.available | 2019-01-30T17:21:07Z | |
dc.date.issued | 2009 | |
dc.identifier.issn | 0013-4686 | |
dc.identifier.uri | https://cer.ihtm.bg.ac.rs/handle/123456789/574 | |
dc.description.abstract | The oxidation of formaldehyde and ethanol on both pure Au(1 1 1) and Au(1 1 1) modified by approximately 0.3 monolayer (ML) of spontaneously deposited Ru was studied by cyclic voltammetry (CV) in 0.5 M H2SO4 solution containing either 0.25 M formaldehyde or 0.35 M ethanol. In situ scanning tunneling microscopy (STM) and CV were employed to characterize the Au(1 1 1) and Ru/Au(1 1 1) surfaces. The oxidation of HCHO on Ru/Au(1 1 1) commences at 0.1 V more negative potential than on pure Au(1 1 1). From 0.25 to 0.55 V vs. (Ag/AgCl), the reaction occurs with increasing current, showing a peak at a potential of 0.43 V. It is assumed that the increasing anodic activity of the Ru/Au(1 1 1) surface is associated with the oxidation of some reaction intermediates, facilitated by the presence of Ru in its metallic state. On the other hand, the oxidation of ethanol on Ru/Au(1 1 1) commences at 0.1 V more positive potential than on pure Au(1 1 1), and proceeds in the potential region from 0.2 to 0.5 V with significantly smaller currents, showing a peak at 0.43 V. This inhibiting effect is explained by the deactivation of the most active Au(1 1 1) step sites by high coverage with Ru islands. The appearance of a small peak at 0.43 V is most likely associated to the oxidation of some intermediates during ethanol oxidation at the Ru/Au step sites formed on the Au(1 1 1) terraces by the presence of a small coverage with Ru islands. | en |
dc.publisher | Oxford : Pergamon-Elsevier Science Ltd | |
dc.relation | info:eu-repo/grantAgreement/MESTD/MPN2006-2010/141001/RS// | |
dc.rights | restrictedAccess | |
dc.source | Electrochimica Acta | |
dc.subject | Au(1 1 1) | en |
dc.subject | Ethanol | en |
dc.subject | Formaldehyde | en |
dc.subject | Oxidation | en |
dc.subject | Ru | en |
dc.subject | Spontaneous deposition | en |
dc.title | Oxidation of formaldehyde and ethanol on Au(1 1 1) and Au(1 1 1) modified by spontaneously deposited Ru in sulfuric acid solution | en |
dc.type | article | |
dc.rights.license | ARR | |
dcterms.abstract | Штрбац, Светлана; Aврамов Ивић, Милка; | |
dc.citation.volume | 54 | |
dc.citation.issue | 23 | |
dc.citation.spage | 5408 | |
dc.citation.epage | 5412 | |
dc.citation.other | 54(23): 5408-5412 | |
dc.citation.rank | M21 | |
dc.identifier.doi | 10.1016/j.electacta.2009.04.031 | |
dc.identifier.scopus | 2-s2.0-67649312282 | |
dc.identifier.wos | 000268518500015 | |
dc.type.version | publishedVersion |