Redox-Electroadsorption Reaction (E-EAR) at a Rotating Disk Electrode (RDE)
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.
Simulated linearized (piecewise linear) concentration profiles of electroactive species using Levich theory are shown. IUPAC conventions, including the comma notation, are used.
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 , , .
 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.