Journal ArticleDOI
Electrocatalytic oxidation of ethanol on Pt-Mo bimetallic electrodes in acid medium
D. M. dos Anjos,Kouakou Boniface Kokoh,J.-M. Léger,A.R. de Andrade,Paulo Olivi,Germano Tremiliosi-Filho +5 more
TLDR
Pt-Mo alloy catalysts were found to be more active than Pt-alone catalysts for ethanol oxidization as mentioned in this paper, and they showed that low molybdenum content in the electrode material enhances the activity toward ethanol oxidation when compared to Pt alone.Abstract:
Pt–Mo alloy electrocatalysts were prepared by an arc-melting furnace process to investigate the origin of their enhanced activity toward ethanol oxidation. Two Mo contents were chosen in zones of the binary phase diagram where they are supposed to form either a pure alloy mixture or a solid solution. Pt–Mo alloy catalysts were more active than Pt-alone. Gradual Mo dissolution at the electrode surface was observed after voltammetric and chronoamperometric measurements. The dissolved Mo contributed to the catalytic effect of the electrode as underpotentially deposited (upd) adatoms. This dissolution probably also leads to an increase in the electrode surface roughness. Low molybdenum content in the electrode material enhances the activity toward ethanol oxidation when compared to Pt-alone. Ethanol oxidation was also investigated by in situ infrared reflectance spectroscopy in order to determine the presence of adsorbed intermediates like CO species. Acetaldehyde, acetic acid and CO2 were also found by spectroscopic experiments.read more
Citations
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Journal ArticleDOI
Catalysts for direct ethanol fuel cells
TL;DR: In this paper, an overview of catalysts tested as anode and cathode materials for DEFCs, with particular attention on the relationship between the chemical and physical characteristics of the catalysts (catalyst composition, degree of alloying, and presence of oxides) and their activity for the ethanol oxidation reaction.
Journal ArticleDOI
Ethanol electro-oxidation on platinum in alkaline media.
TL;DR: A model for the ethanol electro-oxidation reaction in alkaline media is presented, and the differences with the same reaction in acidic media are pointed out.
Journal ArticleDOI
Carbon-supported ternary PtSnIr catalysts for direct ethanol fuel cell
Josimar Ribeiro,D. M. dos Anjos,D. M. dos Anjos,Kouakou Boniface Kokoh,Christophe Coutanceau,J.-M. Léger,Paulo Olivi,A.R. de Andrade,Germano Tremiliosi-Filho +8 more
TL;DR: In this article, TEM and XRD results showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of solid solutions between the metals Pt/Ir and Pt/Sn.
Journal ArticleDOI
Electrocatalytic oxidation of small organic molecules in acid medium: enhancement of activity of noble metal nanoparticles and their alloys by supporting or modifying them with metal oxides.
Pawel J. Kulesza,Izabela S. Pieta,Iwona A. Rutkowska,Anna Wadas,Diana Marks,Karolina Klak,Leszek Stobinski,James A. Cox +7 more
TL;DR: The way in which certain inorganic oxides and oxo species can act effectively as supports for noble metal nanoparticles or their alloys during electrocatalytic oxidation of hydrogen and representative organic fuels is concerns.
Journal ArticleDOI
Electrooxidations of ethanol, acetaldehyde and acetic acid using PtRuSn/C catalysts prepared by modified alcohol-reduction process
Gang Wu,Raja Swaidan,Guofeng Cui +2 more
TL;DR: In this paper, the authors evaluated the contribution of Ru and Sn in the different stages of ethanol oxidation, electrochemical oxidations of adsorbed CO, ethanol, acetaldehyde and acetic acid were performed on each PtRuSn/C catalyst.
References
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Journal ArticleDOI
Platinum Monolayer on Nonnoble Metal−Noble Metal Core−Shell Nanoparticle Electrocatalysts for O2 Reduction
Junliang Zhang,Fabio Henrique Barros de Lima,Minhua Shao,Kotaro Sasaki,Jia X. Wang,Jonathan C. Hanson,Radoslav R. Adzic +6 more
TL;DR: The results demonstrated that high-activity electrocatalysts can be devised that contain only a fractional amount of Pt and a very small amount of another noble metal.
Journal ArticleDOI
Recent progress in the direct ethanol fuel cell: development of new platinum–tin electrocatalysts
TL;DR: In this article, it was shown that poisoning by adsorbed CO coming from the ethanol dissociative chemisorption is greatly reduced leading to a significant enhancement of the electrode activity.
Journal ArticleDOI
On the mechanism of ethanol electro-oxidation on Pt and PtSn catalysts: electrochemical and in situ IR reflectance spectroscopy studies
TL;DR: In this article, the electro-oxidation of ethanol was studied on Pt and PtSn catalysts using electrochemical, in situ reflectance spectroscopy and chromatography techniques.
Journal ArticleDOI
A dems and FTir spectroscopic investigation of adsorbed ethanol on polycrystalline platinum
T. Iwasita,Elena Pastor +1 more
TL;DR: In this paper, the authors used in situ FTir spectroscopy to establish the nature of the strongly adsorbed species of ethanol using isotope labelled ethanol (12CH133CH2OH) discriminate between both carbon containing groups.
Journal ArticleDOI
Parallel pathways of ethanol oxidation: The effect of ethanol concentration
TL;DR: In this paper, the effects of ethanol concentration on the yields of CO2, acetic acid and acetaldehyde as electrooxidation products were investigated, and it was shown that the main oxidation product at low ethanol concentrations is acetic acids, CO2 being produced to a minor extent.