Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum
| Autor: | Juan M. Feliu, Naomi Akiba, R.A.G. Oliveira, Patrícia V.B. Santiago, Júlia Maria Roquetto, Ivanise Gaubeur, Janaina Souza-Garcia, Camilo Andrea Angelucci |
|---|---|
| Přispěvatelé: | Universidad de Alicante. Departamento de Química Física, Universidad de Alicante. Instituto Universitario de Electroquímica |
| Rok vydání: | 2019 |
| Předmět: |
Ethanol
General Chemical Engineering Surface disordering Oxide chemistry.chemical_element Alcohol 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Electrochemistry 01 natural sciences Platinum oxidation 0104 chemical sciences chemistry.chemical_compound chemistry Alcohol electrooxidation Glycerol Química Física Methanol Platinum dissolution 0210 nano-technology Platinum Ethylene glycol |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2019.06.037 |
| Popis: | 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. 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect