DEMS study on the nature of acetaldehyde adsorbates at Pt and Pd by isotopic labelling

Silva-Chong, J; Guillén-Villafuerte, O.; Rodrı́guez, José Luis; Pastor, E.

doi:10.1007/s10008-007-0341-1

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…0.75 V. This peak can be attributed to the oxidation of adsorbed CO on platinum 38,39 resulting from the dissociation of ethanol 26 and acetaldehyde. 27 Finally, there is a distinguishable shoulder or prepeak between 0.40 and 0.60 V. A peak has been observed in this potential region for the voltammetric stripping of adsorbed ethanol on polycrystalline platinum 26 and single-crystal platinum electrodes 15,40 and for the voltammetric oxidation of methane on platinum electrodes 41 and was attributed to the irreversible oxidation of CH x to CO.…”

Section: Resultsmentioning

confidence: 94%

“…Although numerous studies have aimed at the nature of these irreversibly adsorbed species, it is still under debate whether these adsorbates are mainly the result of dissociative adsorption, leading to C 1 species, 16,26,29,42 or a combination of dissociative and molecular adsorption. 23,27,43 As will be discussed below, the SERS results predominantly show dissociative adsorption. Figure 4a shows a series of typical SERS spectra of adsorbed ethanol fragments in perchloric acid at selected potentials.…”

Section: Ethanolmentioning

confidence: 95%

“…Adsorbed carbon monoxide has often been identified as the primary surface poisoning species by FTIR studies, [17][18][19][22][23][24][25] although a second poisoning species originating from the CH 3 group of the ethanol molecule, generally dubbed adsorbed CH x , has often been suggested but has not been observed direct-ly. 16,17,19,21,23,[25][26][27][28][29] For example, methane has been observed upon reduction of adsorbed ethanol 26 and acetaldehyde 27 in DEMS (differential electrochemical mass spectrometry) measurements. In addition, smaller amounts of CO 2 were reported if the oxidation of the adsorbates was preceded by a "reductive" treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Another (related) issue in the ethanol oxidation reaction is the formation of surface poisoning species. Adsorbed carbon monoxide has often been identified as the primary surface poisoning species by FTIR studies, − ,− although a second poisoning species originating from the CH 3 group of the ethanol molecule, generally dubbed adsorbed CH x , has often been suggested but has not been observed directly. ,,,,,− For example, methane has been observed upon reduction of adsorbed ethanol and acetaldehyde in DEMS (differential electrochemical mass spectrometry) measurements. In addition, smaller amounts of CO 2 were reported if the oxidation of the adsorbates was preceded by a “reductive” treatment. , By the isotopic labeling of one of the carbon atoms, it was found that methane was formed from the CH 3 group of the ethanol or acetaldehyde molecule.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of the Dissociation and Electrooxidation of Ethanol and Acetaldehyde on Platinum As Studied by SERS

et al. 2008

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The dissociation and electrooxidation of ethanol and acetaldehyde was studied in perchloric acid on platinum electrodes by employing Surface Enhanced Raman Spectroscopy (SERS). It is found that the scission of the carbon−carbon bond occurs readily at low potentials, leading to adsorbed C1 species. Besides adsorbed CO, chemisorbed CH has been observed for the first time as an adsorbed intermediate in the electrochemical oxidation of ethanol and acetaldehyde. In addition, it is found that the breaking of the C−C bond is easier in acetaldehyde than in ethanol. On the basis of the results obtained here, a reaction mechanism for the dissociation and oxidation of ethanol and acetaldehyde is suggested.

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Section: Resultsmentioning

confidence: 94%

Section: Ethanolmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanism of the Dissociation and Electrooxidation of Ethanol and Acetaldehyde on Platinum As Studied by SERS

et al. 2008

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“…As an attempt to overcome this difficulty, the number of studies concerning the electrooxidation of acetaldehyde has increased in the last few years [5][6][7][8][9][10][11][12][13][14]. Owing to the efforts of different research groups, some important characteristics are already known.…”

Section: Introductionmentioning

confidence: 98%

Search for multi-functional catalysts: The electrooxidation of acetaldehyde on Platinum–Ruthenium–Rhodium electrodeposits

Mello¹,

Giz²,

Câmara³

et al. 2011

Journal of Electroanalytical Chemistry

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a b s t r a c tPreliminary studies on the influence of Platinum-Rhodium electrodeposits upon the rate of acetaldehyde electrooxidation showed that Rhodium plays a dual role during electrooxidation, because it favors the break of C-C bonds whilst prevents the deliverance of oxygen-containing species, thus inhibiting the oxidation steps. Based on these results, in this work Platinum-Ruthenium and Platinum-Ruthenium-Rhodium electrodeposits were prepared and characterized by electrochemical and spectroscopic methods (FTIR in situ). The addition of Ruthenium is justified by its ability to promote a facile oxidation of adsorbed species by activation of water molecules. The results indicate a compromise between the existence of superficial sites able to break carbon chains (provoked by Rhodium) and responsible by the oxidation of adsorbed species (provoked by Ruthenium). Among the atomic compositions investigated, PtRuRh (73:23:04) shows the maximum activity towards acetaldehyde electrooxidation, but the production of acetic acid seems to be the main responsible for this activity.

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Electrochemical Mass Spectrometry: Evolution of the Cell Setup for On‐Line Investigation of Products and Screening of Electrocatalysts for Carbon Dioxide Reduction

et al. 2022

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One of the most important current topics in the renewable and sustainable energy scenario is the CO2 electro‐reduction reaction (CO2RR), which is an alternative and important route for its conversion into various high value‐added chemicals, therefore making up a CO2 recycling process. Despite its importance and the works already developed in this field, many challenges still need to be overcome for CO2RR to reach high values of efficiency and selectivity. This is even more challenging considering that this reaction occurs with the transfer of several electrons, making the investigation and elucidation of the reaction mechanism a real need. Thus, several characterization techniques have been employed, and specially, the on‐line Electrochemical Mass Spectrometry (EC‐MS) technique emerges as a powerful tool, thus making possible to improve the understanding of reaction pathways, through the identification of products and intermediaries, and allowing the screening of electrocatalyst potentials for CO2RR. Herein, we present the evolution of adaptations of general electrochemical cell designs for the study of the CO2RR.

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DEMS study on the nature of acetaldehyde adsorbates at Pt and Pd by isotopic labelling

Cited by 13 publications

References 16 publications

Mechanism of the Dissociation and Electrooxidation of Ethanol and Acetaldehyde on Platinum As Studied by SERS

Mechanism of the Dissociation and Electrooxidation of Ethanol and Acetaldehyde on Platinum As Studied by SERS

Search for multi-functional catalysts: The electrooxidation of acetaldehyde on Platinum–Ruthenium–Rhodium electrodeposits

Electrochemical Mass Spectrometry: Evolution of the Cell Setup for On‐Line Investigation of Products and Screening of Electrocatalysts for Carbon Dioxide Reduction

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