Modelling - Mediator Oxidation

Mediator Oxidation

In a third electrochemical reaction the reduced mediator is regenerated at the electrode.This electrochemical oxidation at the anode surface occurs as shown in equation:

,where M_red is the reduced mediator,
M_ox the oxidized mediator and
k3 is the rate constant of the reaction

Then the current output can be calculated based on formula according to the Faraday's law:

,where I is the current density [A]
[Mred] is the concentration of reduced mediator in the chamber
n is the number of electrons taking part in the electrode reaction,
F is the Faradays constant (96 500 C) and
k3 is the reaction rate, mentioned above.

Simulation

Figure 1: Curves for the cuurent output, fluxes of concentration of the intermediates. Simulation performed for the start concentration of both NAD and oxidized mediator at 100 µM.

References