Journal ArticleDOI
Formation of intermediates during methanol oxidation : A quantitative DEMS study
TLDR
In this article, the current efficiencies for the formation of CO2 during methanol oxidation at smooth polycrystalline platinum electrodes were determined by differential electrochemical mass spectrometry in a thin layer flow through cell.Abstract:
Current efficiencies for the formation of CO2 during methanol oxidation at smooth polycrystalline platinum electrodes were determined by differential electrochemical mass spectrometry in a thin layer flow through cell In all cases, the current efficiencies are below 60%; in particular, values as low as 16% were found in 01 M methanol solution at 06 V, which shows that a large amount of soluble intermediates (formaldehyde and/or formic acid) are formed The extent to which these soluble intermediates are further oxidized to CO2 depends on the diffusion conditions For methanol oxidation a parallel oxidation path via COad is also active The influence of the surface crystal structure and, in particular, of steps was also studied Step decoration by foreign metals allowed examination of the effect of cocatalytic metals on well defined model surfacesread more
Citations
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Journal ArticleDOI
Electrocatalysis of methanol oxidation
TL;DR: Most relevant aspects of methanol electrooxidation on Pt electrodes, including voltametric as well as spectroscopic data on the system are presented and discussed Parallel reaction pathways have been demonstrated, producing CO 2 and HCOOH or HCHO as soluble products as mentioned in this paper.
Journal ArticleDOI
Electrocatalysis for Polymer Electrolyte Fuel Cells: Recent Achievements and Future Challenges
TL;DR: In this article, a focused overview summarizing the most outstanding contributions in the last 10 years in terms of activity and durability of the catalyst materials for ethanol oxidation and oxygen reduction reaction, respectively.
Journal ArticleDOI
Formate, an active intermediate for direct oxidation of methanol on pt electrode.
TL;DR: A near proportional relationship between the intensity of the IR band of the formate species and MeOH electro-oxidation current is observed and a new reaction scheme via non-CO pathway with formate as the active intermediate is proposed for the methanol electro-Oxidation process.
Journal ArticleDOI
Differential electrochemical mass spectrometry.
TL;DR: Differential electrochemical mass spectrometry (DEMS) can be used not only to identify products or intermediates of continuous faradaic reactions, but also to characterize submonolayer amounts of adsorbates on polycrystalline and single crystal electrode surfaces by means of their desorption, because of its high sensitivity.
Journal ArticleDOI
Ethanol Electrooxidation on a Carbon-Supported Pt Catalyst: Reaction Kinetics and Product Yields
TL;DR: In this paper, a carbon-supported Pt nanoparticle catalyst was studied by cyclic voltammetry and potential-step measurements as a function of ethanol concentration and reaction temperature, combining on-line mass spectrometric analysis of the reaction products and electrochemical current measurements.
References
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Journal ArticleDOI
Methanol electrooxidation on well-characterized platinum-ruthenium bulk alloys
TL;DR: In this paper, the catalytic activity of single-phase polycrystalline Pt-Ru bulk alloys toward the electrooxidation of methanol in sulfuric acid electrolyte at room temperature was measured for the first time on well-characterized alloy surfaces, in terms of surface composition and true surface area.
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High performance direct methanol polymer electrolyte fuel cells
TL;DR: In this article, a decal transfer method was used to apply thin-film catalyst/ionomer composite layers to Nation® membranes and achieved a maximum power density of 250 mW/cm2.
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Electrochemistry of Methanol at Low Index Crystal Planes of Platinum: An Integrated Voltammetric and Chronoamperometric Study
TL;DR: In this article, the authors studied a catalytic decomposition of methanol on low Miller index platinum surfaces, Pt(111), Pt(110), and Pt(100) in perchloric, sulfuric, and phosphoric acids at room temperature.
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Structural effects and reactivity in methanol oxidation on polycrystalline and single crystal platinum
TL;DR: In this article, the role of hydrogen as inhibitor of methanol adsorption was confirmed once more by means of in situ FTIR spectra, which indicated that the splitting off of hydrogen atoms is superimposed on hydrogen desorption and gives rise to a well defined peak at polycrystalline and at Pt(100).
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A New Approach for Simultaneous DEMS and EQCM: Electro‐oxidation of Adsorbed CO on Pt and Pt‐Ru
TL;DR: The combination of differential electrochemical mass spectrometry (DEMS) and electrochemical quartz crystal microbalance (EQCM) is possible by means of a new dual thin layer cell as mentioned in this paper.