Electrooxidation of ethanol at polycrystalline and platinum stepped single crystals: A study by differential electrochemical mass spectrometry

Abd-El-Latif, Abd-El-Aziz A.; Mostafa, Ehab; Huxter, Sharon Elizabeth; Attard, Gary Anthony; Baltruschat, Helmut

doi:10.1016/j.electacta.2010.04.008

Cited by 71 publications

(68 citation statements)

References 33 publications

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“…where n is a parameter determined from the ratio between the stable I44 and I29 currents in the oxidation transients at 0.9 V at each pH, and assuming that the efficiency for acetaldehyde production at this potential is 100%, as has been observed previously [36]. The values obtained for n are always between 0.60 and 0.65.…”

Section: Methodsmentioning

confidence: 74%

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Ethanol oxidation on shape-controlled platinum nanoparticles at different pHs: A combined in situ IR spectroscopy and online mass spectrometry study

Busó-Rogero

Brimaud

Sollá-Gullón

et al. 2016

Journal of Electroanalytical Chemistry

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Ethanol oxidation on different shape-controlled platinum nanoparticles at different pHs was studied using electrochemical, Attenuated Total Reflection -Fourier Transform Infrared Spectroscopy (ATR-FTIR) and, especially, Differential Electrochemical Mass Spectrometry (DEMS) techniques, which gives interesting quantitative information about the products of ethanol oxidation. Two Pt nanoparticle samples were used for this purpose: (100) and (111) preferentially oriented Pt nanoparticles. The results are in agreement with previous findings that the preferred decomposition product depends on surface structure, with COads formation on (100) domains and acetaldehyde/acetic acid formation on (111) domains. However, new information has been obtained about the changes in CHx and CO formation at lower potentials when the pH is changed, showing that CHx formation is favored against the decrease in CO adsorption on (100) domains. At higher potentials, complete oxidation to CO2 occurs from both CHx and CO fragments. In (111) Pt nanoparticles, the splitting of C-C bond is hindered, favoring acetaldehyde and acetate formation even in 0.5 M H2SO4. C1 fragments become even less when the pH increases, being nearly negligible in the highest pH studied.

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Section: Methodsmentioning

confidence: 74%

“…After that, a COads stripping experiment was carried out. The calibration constant K* was calculated by comparison of the Faradaic oxidation current and the CO2 mass signal, using the following equation [36]:…”

Section: Methodsmentioning

confidence: 99%

Ethanol oxidation on shape-controlled platinum nanoparticles at different pHs: A combined in situ IR spectroscopy and online mass spectrometry study

Busó-Rogero

Brimaud

Sollá-Gullón

et al. 2016

Journal of Electroanalytical Chemistry

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“…While the latter, low potential peak, is usually assigned to oxidation of surface-adsorbed CO ads. species, the former peak corresponds to the formation of other EOR surface oxidation products but primarily to acetaldehyde [13,[26][27][28][29]. Furthermore, a small but discernible cathodic peak C, observable in the CV profile at ca.…”

Section: Resultsmentioning

confidence: 99%

On the Temperature Performance of Ethanol Oxidation Reaction at Palladium-Activated Nickel Foam

2014

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The present paper reports on ethanol oxidation reaction (EOR) investigated at catalytically modified nickel foam material. The EOR was studied in 0.1 M NaOH supporting electrolyte on Pd-activated nickel foam catalyst material, obtained by a spontaneous deposition method. Catalytic modification of Ni foam resulted in a composite material having superior EOR kinetics, as elucidated through corresponding values of a.c. impedance-derived charge-transfer resistance parameter (including temperature-dependence of the EOR over the temperature range 20-60°C). The presence of a catalytic additive was disclosed from SEM and XRD analyses.

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“…0.50-0.90 V) upon the reverse scan towards the hydrogen reversible potential is generally assigned to the process of surface oxidation of CO ads. species [16,[24][25][26].…”

Section: Methodsmentioning

confidence: 99%

“…Platinum [4,[24][25][26][27][28] and especially PtSn [1,2,27,[29][30][31][32] catalysts are well-known to exhibit superior electrocatalytic properties towards the EOR. Thus, in this contribution, Ptand PtSn-modified Ni foam electrodes were prepared by means of spontaneous deposition methods [16,30,33,34].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Ethanol Oxidation Reaction on Pt (PtSn)-Activated Nickel Foam Through In situ Formation of Nickel Oxy-Hydroxide Layer

Pierożyński

Mikołajczyk

2017

Electrocatalysis

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The present paper reports on a significant enhancement of ethanol oxidation reaction (EOR), investigated on Pt and PtSn-modified nickel foam electrodes, realized via in situ formation of surface nickel oxy-hydroxide layer in 0.1 M NaOH solution. In the presence of ethanol in electrolyte, adsorbed C 2 H 5 OH molecules (and/or its oxidation intermediates) prevent Pt (PtSn) sites from their extensive dissolution upon prolonged surface electrooxidation of Ni foam electrode. The above was elucidated through cyclic voltammetry examinations and a.c. impedance-derived charge transfer resistance parameter values. Surface topography and the presence of catalytic additives were revealed from the combined scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) analyses.

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Electrooxidation of ethanol at polycrystalline and platinum stepped single crystals: A study by differential electrochemical mass spectrometry

Cited by 71 publications

References 33 publications

Ethanol oxidation on shape-controlled platinum nanoparticles at different pHs: A combined in situ IR spectroscopy and online mass spectrometry study

Ethanol oxidation on shape-controlled platinum nanoparticles at different pHs: A combined in situ IR spectroscopy and online mass spectrometry study

On the Temperature Performance of Ethanol Oxidation Reaction at Palladium-Activated Nickel Foam

Enhancement of Ethanol Oxidation Reaction on Pt (PtSn)-Activated Nickel Foam Through In situ Formation of Nickel Oxy-Hydroxide Layer

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