A Study of Methanol Oxidation by Dynamic Electrochemical Impedance Spectroscopy

Dahlstrøm, Per Kristian; Harrington, David A.; Seland, Frode

doi:10.1149/1.3695100

Cited by 5 publications

(1 citation statement)

References 29 publications

(45 reference statements)

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“…Since its development in the 1990s, [29,30] the technique has evolved continuously. dEIS has been used, e. g., for the study of corrosion, [31,32] methanol oxidation, [33][34][35] fuel cells, [36,37] and electrocatalysis. [38] The technique is based on the application of a multisinusoidal perturbation instead of a sequential single sine.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Electrochemical Impedance Spectroscopy for the Evaluation of Localised Corrosion on Aluminium Alloys

Mysliu,

Holm,

ten Cate

et al. 2023

ChemElectroChem

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Dynamic electrochemical impedance spectroscopy (dEIS), an extension of conventional EIS, was used for rapid measurements of initiation of localised corrosion on 3005 aluminium alloys with different Mn (1.08–1.39 wt. %) and Cu (0.15–0.22 wt. %) content by evaluating the onset and evolution of a Faradaic process observed in 0.5 M Na2SO4+0.1 M NaCl. Differences between samples were detected with highest sensitivity from the charge transfer resistance during chronoamperometry at ca. 120 mV above the corrosion potential. These differences were caused by differences in pitting initiation, and correlated well with filament density from a filiform corrosion (FFC) test of samples coated with a 20 μm epoxy topcoat. The observation can be explained by the role of pitting in FFC initiation and the similarity in FFC propagation with pit growth. The results suggest that dEIS is an efficient method for screening alloys for their FFC susceptibility.

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Section: Introductionmentioning

confidence: 99%

Dynamic Electrochemical Impedance Spectroscopy for the Evaluation of Localised Corrosion on Aluminium Alloys

Mysliu,

Holm,

ten Cate

et al. 2023

ChemElectroChem

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Catalysts for Methanol Oxidation

González

Mota-Lima

2013

Direct Alcohol Fuel Cells

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Methanol electroxidation proceeds via a multistep reaction. Herein, mechanisms of reaction and reaction rates of sub-set of the mechanism on different surfaces are discussed. Platinum is a reasonable catalyst for the first methanol electroxidation steps (dehydrogenation), but not for the last (CO electroxidation). Hence, alloying Platinum with a second metal was used as a strategy to enhance the rate of the last step. Accordingly, enhanced rates of CO electroxidation are attained by modifying the bonding energy of the adsorbate to the catalyst or by promoting the formation of oxygenated species at lower overvoltage. Finally, new perspectives on the field of methanol catalysts are commented including the search for catalysts that promote early onset of oscillations, i.e. under lower overvoltage. IntroductionMethanol is the typical fuel with one carbon (C1) atom for fuel cells. Methanol was one of the first small molecules chosen to study the oxidation on platinum group metals in the very early beginning of electrocatalysis. In that time, the oxidation of other C1 molecules such as formic acid and formaldehyde (interest in CO oxidation came latter with the oxidation of reformatted gases) were investigated as a model oxidation because their elementary steps were supposedly present in the mechanism of methanol oxidation. From the point of view of CO 2 emission, methanol has, among the other small molecules, the highest energy production per unit of produced

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Impedance Spectroscopy Applied to the Study of Electrocatalytic Processes

Lasia

2018

Encyclopedia of Interfacial Chemistry

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A Study of Methanol Oxidation by Dynamic Electrochemical Impedance Spectroscopy

Cited by 5 publications

References 29 publications

Dynamic Electrochemical Impedance Spectroscopy for the Evaluation of Localised Corrosion on Aluminium Alloys

Dynamic Electrochemical Impedance Spectroscopy for the Evaluation of Localised Corrosion on Aluminium Alloys

Catalysts for Methanol Oxidation

Impedance Spectroscopy Applied to the Study of Electrocatalytic Processes

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