When measuring the CV of a metal complex, I see an irreversible oxidation peak. We are interested in the amount of electrons that are involved in this oxidation event. How can one determine if the irreversible peak is the result of a one or a two electron reaction?
I added an image of the CV. I believe that using Laviron's equation is not suitable here because we are not investigating an adsorption reaction, everything in our system is homogeneous.
from the change in the fast of electron transfer rate constant
Dear Francis Bru ,
if you plot the peak current as a function the square root of the scan rate, you could get the number of electrons involved in the reaction knowing the diffusion coefficient of the electroactive species, the initial concentration and the symmetry factor.
You can find more details in p. 4 of the following application note:
https://www.biologic.net/wp-content/uploads/2019/08/cv-simulation_electrochemistry-an41-1.pdf
The note uses the cyclic voltammetry simulation tool of EC-Lab. A demo version can be found here:
https://www.biologic.net/wp-content/uploads/2021/06/ec-lab_demo.exe
Let me know if this helps,
Best regards,
Nicolas
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