A kinetic analysis of the electro-oxidation of ethanol at a platinum electrode in acid medium

Hitmi, H.; Belgsir, E.M.; Léger, Jean‐Michel; Lamy, C.; Lezna, Reynaldo O.

doi:10.1016/0013-4686(94)80080-4

Cited by 288 publications

(227 citation statements)

References 20 publications

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“…The current density for peak B is close to 50 µA/cm 2 , which is similar to that obtained by other authors [16,17] in the oxidation of diols when studied under the same conditions: 25 mM and v = 0.01 V/s (Figure 2). This fact also agrees with a very similar electrochemical oxidation process for GHB corresponding with the oxidation of the alcohol group to aldehyde and to the carboxylic acid to obtain succinic acid.…”

Section: Figuresupporting

confidence: 89%

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Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium

Jiménez‐Pérez

Sevilla

Pineda

et al. 2013

Electrochimica Acta

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Abstract.Gamma Hydroxybutyric Acid (GHB), when studied in a platinum electrode using cyclic voltammetry, presented three oxidation peaks in acid solutions that correspond to the oxidation of the alcohol group to the corresponding aldehyde and carboxylic acid (succinic acid). An anodic scan of GHB yielded two characteristic waves, which indicates an oxidation process dependent on the chemical environment on the surface of the electrode. The cathodic scan presented an inverted oxidation peak with an onset partially overlapping with the tail of the cathodic peak for the reduction of the platinum oxide formed initially during the anodic scan. This inverted peak can be observed at a potential close to +0.2V (vs Ag/AgCl at pH 2) and separated 0.4 and 0.8 V from the two other oxidation peaks obtained during the anodic scan and in such conditions that the surface is particularly activated to favour this electrochemical process. The response obtained in the electronic current for the different peaks when GHB concentration and scan rate were changed allows inferring that these are the result of a potential dependent mechanism.

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Section: Figuresupporting

confidence: 89%

“…The values obtained for GHB are much lower than these, which seems to indicate that the GHB oxidation occurs through a complex surface process where platinum hydroxides play an important role since has been described by several authors (16,17,(23)(24)(25)(26)). …”

Section: Influence Of the Scan Ratementioning

confidence: 71%

Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium

Jiménez‐Pérez

Sevilla

Pineda

et al. 2013

Electrochimica Acta

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“…Both CO as a poisoning agent and CO 2 have been clearly observed by infrared reflectance spectroscopy and gas chromatography [26][27]. The oxidation current density at the peak potential increased when Co 3 O 4 was added, it appears that the presence of Co 3 O 4 facilitates the oxidation of freshly chemisorbed species and leads to an enhanced activity for methanol electro-oxidation, in which Co 3 O 4 provides active oxygen for removal of intermediates such as CO on the Pt surface effectively.…”

Section: For Methanol Electro-oxidationmentioning

confidence: 99%

Substitute of Expensive Pt with Improved Electrocatalytic Performance and Higher Resistance to CO Poisoning for Methanol Oxidation: the Case of Synergistic Pt-Co3O4 Nanocomposite

Zhao

Zheng

et al. 2013

Nano-Micro Lett.

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Abstract:In this paper, Pt-Co3O4 nanocomposite was synthesized by a sol-gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and current densitytime curve. It is found that the resultant Pt-Co3O4 catalysts with minute amount of Pt exhibite attractive electrocatalytic activity for methanol oxidation reaction (MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co3O4. Together with the low manufacturing cost of Co3O4, the reported nanostructured Pt-Co3O4 catalyst is expected to be a promising electrode material for direct methanol fuel cells (DMFC).

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“…However, during this process some poisoning intermediates, such as CO, can be formed and adsorb strongly on the catalysts surfaces blocking the active sites from further oxidation reactions [2][3][4], thus decreasing the overall performance of the catalyst and the cell.…”

Section: Introductionmentioning

confidence: 99%

Trimetallic catalyst based on PtRu modified by irreversible adsorption of Sb for direct ethanol fuel cells

Figueiredo

Sorsa

Arán‐Ais

et al. 2015

Journal of Catalysis

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Abstract:In this work, PtRu/C-Sb materials prepared by adding a Sb salt to the ink of commercial PtRu/C were studied as catalysts for ethanol oxidation. The prepared trimetallic catalysts showed enhanced properties for ethanol oxidation trough a wide range of surface coverages. However, coverage higher than 0.7 of Sb on PtRu/C causes the decrease of the catalytic activity suggesting that specific sites composed by the 3 metals are necessary to achieve the highest performance. In situ Fourier Transformed Infrared Spectroscopy experiments were also performed to compare the reaction products of the bimetallic and trimetallic catalysts. The catalysts were also tested under fuel cell conditions. Also in this case, higher power densities, higher open circuit voltages and better stability than the bimetallic substrate were found. With this catalyst preparation method, the catalysts showed 2 times higher current densities than for the PtRu catalysts and 6 times better than for pure Pt anodes.

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A kinetic analysis of the electro-oxidation of ethanol at a platinum electrode in acid medium

Cited by 288 publications

References 20 publications

Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium

Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium

Substitute of Expensive Pt with Improved Electrocatalytic Performance and Higher Resistance to CO Poisoning for Methanol Oxidation: the Case of Synergistic Pt-Co3O4 Nanocomposite

Trimetallic catalyst based on PtRu modified by irreversible adsorption of Sb for direct ethanol fuel cells

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