Az oxigén elektrokémiai redukciojânak vizsgâlata aranyelektródon impedanciaspektroszkópiával Vizsgálatok nátrium-perklorát- És perklorsavoldatokban

Translated title of the contribution: Investigation of the electrochemical reduction of molecular oxygen at gold electrodes by impedance spectroscopy - Measurements in perchloric acid and sodium-pcrchloratc solutions

Torma Viktória És, G. Láng

Research output: Contribution to journalArticle

Abstract

Oxygen reduction on polycrystalline Au has been studied by the rotating disk technique combined with impedance spectroscopy in acid sodium perchlorate and perchloric acid solutions. A general kinetic model has been proposed which takes into account the diffusion of a reactant to the electrode, the diffusion of the product in the opposite direction and a solution-soluble intermediate. On the basis of the kinetic model an expression has been derived for the ac impedance of the electrode. Characteristic physico-chemical parameters of the system (e.g. diffusion coefficient of oxygen, heterogeneous rate constant, transfer coefficient, etc.) have been evaluated from impedance data by CNLS fitting. The values determined on the basis of polarisation curves are in good agreement with the results of impedance spectroscopy.

Original languageHungarian
Pages (from-to)274-276
Number of pages3
JournalMagyar Kemiai Folyoirat, Kemiai Kozlemenyek
Volume104
Issue number7
Publication statusPublished - 1998

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Molecular oxygen
Gold
Sodium
Spectroscopy
Electrodes
Oxygen
Kinetics
Rotating disks
Rate constants
Polarization
Acids
Perchloric Acid

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Az oxig{\'e}n elektrok{\'e}miai redukcioj{\^a}nak vizsg{\^a}lata aranyelektr{\'o}don impedanciaspektroszk{\'o}pi{\'a}val Vizsg{\'a}latok n{\'a}trium-perklor{\'a}t- {\'E}s perklorsavoldatokban",
abstract = "Oxygen reduction on polycrystalline Au has been studied by the rotating disk technique combined with impedance spectroscopy in acid sodium perchlorate and perchloric acid solutions. A general kinetic model has been proposed which takes into account the diffusion of a reactant to the electrode, the diffusion of the product in the opposite direction and a solution-soluble intermediate. On the basis of the kinetic model an expression has been derived for the ac impedance of the electrode. Characteristic physico-chemical parameters of the system (e.g. diffusion coefficient of oxygen, heterogeneous rate constant, transfer coefficient, etc.) have been evaluated from impedance data by CNLS fitting. The values determined on the basis of polarisation curves are in good agreement with the results of impedance spectroscopy.",
author = "{\'E}s, {Torma Vikt{\'o}ria} and G. L{\'a}ng",
year = "1998",
language = "Hungarian",
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journal = "Magyar Kemiai Folyoirat, Kemiai Kozlemenyek",
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AU - És, Torma Viktória

AU - Láng, G.

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N2 - Oxygen reduction on polycrystalline Au has been studied by the rotating disk technique combined with impedance spectroscopy in acid sodium perchlorate and perchloric acid solutions. A general kinetic model has been proposed which takes into account the diffusion of a reactant to the electrode, the diffusion of the product in the opposite direction and a solution-soluble intermediate. On the basis of the kinetic model an expression has been derived for the ac impedance of the electrode. Characteristic physico-chemical parameters of the system (e.g. diffusion coefficient of oxygen, heterogeneous rate constant, transfer coefficient, etc.) have been evaluated from impedance data by CNLS fitting. The values determined on the basis of polarisation curves are in good agreement with the results of impedance spectroscopy.

AB - Oxygen reduction on polycrystalline Au has been studied by the rotating disk technique combined with impedance spectroscopy in acid sodium perchlorate and perchloric acid solutions. A general kinetic model has been proposed which takes into account the diffusion of a reactant to the electrode, the diffusion of the product in the opposite direction and a solution-soluble intermediate. On the basis of the kinetic model an expression has been derived for the ac impedance of the electrode. Characteristic physico-chemical parameters of the system (e.g. diffusion coefficient of oxygen, heterogeneous rate constant, transfer coefficient, etc.) have been evaluated from impedance data by CNLS fitting. The values determined on the basis of polarisation curves are in good agreement with the results of impedance spectroscopy.

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