Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum

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Title: Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum
Authors: Santiago, Patrícia V.B. | Oliveira, R.A.G. | Roquetto, Júlia Maria | Akiba, Naomi | Gaubeur, Ivanise | Angelucci, Camilo Andrea | Souza-Garcia, Janaina | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Platinum oxidation | Surface disordering | Platinum dissolution | Alcohol electrooxidation
Knowledge Area: Química Física
Issue Date: 10-Sep-2019
Publisher: Elsevier
Citation: Electrochimica Acta. 2019, 317: 694-700. doi:10.1016/j.electacta.2019.06.037
Abstract: The creation of defects on the surface of Pt(111) and Pt(100) and the dissolution of Pt were used as probes to investigate the oxidation of the surface in the absence and in the presence of methanol, ethanol, glycerol and ethylene glycol. Electrochemical and Graphite Furnace Atomic Absorption Spectrometry showed that in the presence of ethanol, glycerol and ethylene glycol, in the same potential window, the formation of defects is decreased in comparison to the oxidation of platinum in the absence of these alcohols. Since both the oxidation of the alcohols and the oxidation of the surface depend on PtOH formation, the competition for this species can displace the potential at which the oxidation of the surface oxidation to PtO is favored in the presence of ethanol, glycerol and ethylene glycol. On the other hand, the presence of methanol does not influence the oxidation and subsequent disordering of the surface, possibly because this reaction takes place in parallel with platinum oxidation to PtO.
Sponsor: This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil (CAPES), Finance Code 001. The authors also thank FAPESP (projects 2013/13749–0 and 2016/23878-0) and CNPq for PIC/PIBIC (R.A.G. Oliveira and J.M. Roquetto) and DAI (N. Akiba) scholarships and projects 474590/2013–5 and 456758/2014–3. The authors are grateful to the Multiuser Central Facilities (UFABC) for experimental support.
URI: http://hdl.handle.net/10045/93809
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2019.06.037
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier Ltd.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.electacta.2019.06.037
Appears in Collections:INV - EQSUP - Artículos de Revistas

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