Study of the electrooxidation of n-propanol on an Au electrode in basic medium

Ocón, P.; Alonso, C.; Celdrán, R.; González‐Velasco, J.

doi:10.1016/0022-0728(86)90267-6

Cited by 82 publications

(43 citation statements)

References 13 publications

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“…It should be emphasised that the potential range in which the amine molecules are adsorbed on the goldalkaline solution interface coincides with that in which the adsorption of hydroxyl ions occurs [12,20,27,28,55]. Thus a quantitative evaluation of the C-E curves in this medium is not possible because of the competing adsorption of amine and hydroxyl ions at the electrode surface and only qualitative information about the relative adsorptivity of the system can be obtained.…”

Section: Resultsmentioning

confidence: 97%

“…This effect does not apply to gold which has no vacancy in its d-bands and thus is characterized by relatively poor adsorption properties [17][18][19][20][21][22][23][24] as compared with platinum. Though these adsorption properties of gold account for its weak catalytic activity in acid solution, in alkaline solutions, when hydroxide ions adsorb on the gold surface [12,[25][26][27][28][29][30][31][32][33][34], gold proves to be a more effective catalyst for dehydrogenation of organic compounds than platinum.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviour of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine at gold. A comparative study

Łuczak

2007

J Appl Electrochem

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The electrooxidation of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine (tyramine) at a gold electrode in contact with an alkaline electrolyte solution was studied. The effect of amine concentration, electrolyte pH and potential scan rate on the electrooxidation was analysed. The adsorption of amines on the goldsolution interface was found to play a significant role in the oxidation mechanism. The rate determining step was the heterogeneous dehydrogenation of the amine molecule, involving electron transfer to the gold electrode and the formation of a water molecule. The catalytic effect of the gold electrode on both benzylamine and 2-phenylethylamine oxidation is higher than that for tyramine.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine at gold. A comparative study

Łuczak

2007

J Appl Electrochem

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“…1 The other, more indirect, evidence for these transitions at low potentials is the onset of electrocatalytic currents for the oxidation of dissolved organics on the anodic sweep at the various potentials quoted above. This aspect will be discussed in more detail later for A and B but it is worth pointing out here that the earlier suggestion [1] as to the importance in the case of electrocatalysis at gold in base of the transition at C -this was assumed [1] to be Au/Au (III) hydrous oxide transition -is borne out by the more recently published data of Oeon and coworkers [18]. It is clear from Fig.…”

Section: The Behaviour Of Gold At Low Potentials In Organic-free Basementioning

confidence: 85%

The importance of superficial (adatom) surface oxidation in the electrocatalytic behaviour of noble metals in aqueous media

Burke

O'Leary

1989

J Appl Electrochem

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The conventional, activated chemisorption, model of electrocatalysis is unable to explain fully the surprisingly high level of activity of gold anodes in base for certain organic electrooxidation reactions or even the ability of platinum to catalyse certain oxygen insertion reactions, e.g. methanol or formaldehyde oxidation in acid, at low potentials (in the hydrogen or double layer region) where the surface is considered usually to be oxygen-free. It was demonstrated that such behaviour can be rationalized by postulating the involvement of a quite low coverage of hydrous oxide species, generated at low potential at adatom sites, which act as mediators or catalysts in many electrooxidation reactions. The converse situation was also shown to arise, i.e. the reduction of certain species, e.g. HNO3 or NO;-, which requires the involvment of adatoms, was shown to be inhibited as long as the latter existed in the oxidized, hydrous oxide, form. An appreciation of hydrous oxide electrochemistry was shown to be very useful in interpreting electrocatalytic effects at noble metal electrodes in aqueous media.

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“…e) The rate determining step, likely involve the concerted formation of a bridged cyclic intermediate and the abstraction of a hydrogen from the carbon in a-position with respect to alcohol group. Cyclic intermediate formation has already been suggested for the oxidation of 1-propanol on Au electrode [62].…”

Section: Electrocatalytic Oxidation Of Methanol At the Niohp Modifiedmentioning

confidence: 97%

Electrocatalytic Oxidation of Methanol on a Nickel‐Porphyrin IX Complex Modified Glassy Carbon Electrode in Alkaline Medium

Golabi

Nozad

2004

Electroanalysis

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Electrocatalytic oxidation of methanol on a glassy carbon disc electrode modified with Ni(II)-hematoporphyrin IX, complex and conditioned by potential recycling in a limited range (between 100 and 600 mV vs. SCE) in 0.10 M NaOH solution, abbreviated as NiOHPME(A), was studied by cyclic voltammetry in alkaline medium. The results were compared with those obtained for a NiO modified glassy carbon electrode, NiOME, prepared in similar conditions. The findings show that the NiOHP film at NiOHPME(A) behaves as an efficient electrocatalyst for the oxidation of methanol in alkaline medium via Ni(III) species with the cross-exchange reaction occurring throughout the layer at a low concentration of methanol and for a thin film of modifier. A plausible mechanism was proposed for catalytic oxidation of methanol at NiOHP modified electrode. Moreover, the effects of various parameters such as the scan rate, methanol concentration, thickness of NiOHP film and the real surface area of modified electrode on the oxidation of methanol were investigated. Finally, it has been shown that the NiOHPME(A) has a long-term stability toward the oxidation of methanol.

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Study of the electrooxidation of n-propanol on an Au electrode in basic medium

Cited by 82 publications

References 13 publications

Electrochemical behaviour of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine at gold. A comparative study

Electrochemical behaviour of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine at gold. A comparative study

The importance of superficial (adatom) surface oxidation in the electrocatalytic behaviour of noble metals in aqueous media

Electrocatalytic Oxidation of Methanol on a Nickel‐Porphyrin IX Complex Modified Glassy Carbon Electrode in Alkaline Medium

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