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Redox-Electroadsorption Reaction (E-EAR) at a Rotating Disk Electrode (RDE)

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This Demonstration shows plots of dimensionless current density versus potential ( versus ) curves, and changes of electroactive species concentrations, and the fractional surface coverage of adsorbed species , , for a redox-electroadsorption reaction (E-EAR) reaction under steady-state conditions at an RDE.

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Simulated linearized (piecewise linear) concentration profiles of electroactive species using Levich theory are shown. IUPAC conventions, including the comma notation, are used.

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Contributed by: M. B. Molina-Concha, J.-P. Diard, and C. Montella (April 2011)
(CNRS–Grenoble, INP–Université de Savoie, Université Joseph Fourier, France)
Concentration plot suggested by: M. Keddam
Open content licensed under CC BY-NC-SA

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The expression for versus for the (E-EAR) reaction is:

,

where , , , , , , .

There are two limiting cases.

Limiting current corresponding to the oxidation of R species, on an electrode free of adsorbed species: ; and limiting current due to the mass transport of R species: , where , , .

Reference

[1] M. Chatenet, M. B. Molina–Concha, and J.-P. Diard, "First Insights into the Borohydride Oxidation Reaction Mechanism on Gold by Electrochemical Impedance Spectorscopy," Electrochimica Acta, 54(6), 2009 pp. 1687–1693.

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