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The application of the methods of electrode kinetics, especially the impedance, to the study of gas evolving reactions at electrodes

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Abstract

The methods of electrode kinetics, particularly steady state current-potential and impedance-potential measurements, have been successfully applied to the investigation of gas forming reactions, such as chlorine, oxygen and hydrogen evolution. Developments in computer-controlled instrumentation have made these the preferred methods (together with potential pulse methods). The paper discusses the results and suggests how these can be interpreted in terms of the electron transfer reaction and the bubble layer.

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Abbreviations

c bA :

bulk concentration of A

C sA :

surface concentration of A

C dl :

differential capacity

D a :

diffusion coefficient of A

E :

potential w.r.t SCE electrode

E 0 :

standard potential w.r.t SCE (1 mol cm−3 concentrations)

k A :

rate constant w.r.t appliedE

F :

Faraday number

i :

current density

j :

square root of −1

a :

anodic Tafel slope

b :

cathodic Tafel slope

R ω :

ohmic loss resistance

R ct :

charge transfer resistance

Z(ω):

impedance

ω :

frequency of ac potential

δ :

diffusion layer thickness

σ :

Warburg impedance parameter

References

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Authors and Affiliations

  1. School of Chemistry, University of Newcastle-on-Tyne, NE1 7RU, Newcastle-on-Tyne, England

    J. A. Harrison

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  1. J. A. Harrison
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Harrison, J.A. The application of the methods of electrode kinetics, especially the impedance, to the study of gas evolving reactions at electrodes. J Appl Electrochem 15, 495–501 (1985). https://doi.org/10.1007/BF01059290

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  • DOI: https://doi.org/10.1007/BF01059290

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