Hello,
I am working with electrode materials that exhibit battery-like behavior. For the cyclic voltammetry results, I did the graph of the current vs. square root of scan rate to talk about diffusion-limited processes. I would like to calculate the diffusion coefficient from Randles-Sevcik equation, but I'm not understanding some terms, such as C and A. The equation is:
ip = (2.687 x 105) n3/2 A D1/2 C v1/2
I used 3 M KOH electrolyte, 3 is the value for C? Another question is: I used Ni foam (1 cm x 1 cm), so, 1 cm² is the value of A?
What is the peak current that I should use? I used a scan rate range of 5-100 mV/s. Should I use ip for 100 mV/s?
Dear Allan J. M. Araújo
" I used 3 M KOH electrolyte, 3 is the value for C? " no this is not the C. This is the concentration of electrolyte. We need the concentration of the redox species that is dissolved in electrolyte and to calculate the diffusion coefficient of that redox species. Area "A" is fine.
You have to take all the scan rate value for the calculation.
Best regards,
Bapi
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