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

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 Spectr...

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Bibliographic Details
Published in:Electrochimica acta 2019-09, Vol.317, p.694-700
Main Authors: Santiago, P.V.B., Oliveira, R.A.G., Roquetto, J.M., Akiba, N., Gaubeur, I., Angelucci, C.A., Souza-Garcia, J., Feliu, J.M.
Format: Article
Language:English
Subjects:
Alcohol
Alcohol electrooxidation
Alcohols
Atomic absorption analysis
Competition
Defects
Ethanol
Ethylene glycol
Glycerol
Methanol
Oxidation
Platinum
Platinum dissolution
Platinum oxidation
Surface disordering
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Summary: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. •The oxidation of Pt surface in the presence and absence of alcohols was studied.•The oxidation of Pt surface was measured by the amount of defects created and platinum dissolution analysis.•Oxidation of Pt surface is prevented in the presence of alcohols different than methanol due to the competition for OHads.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.06.037