I'm working with Zeolites as electrode materials that exhibit battery-like behavior in three-electrode configuration. So, I did plots of peak current versus v1/2 used to calculate the slopes for the oxidation and reduction peaks. Now, I'd like to determine the diffusion coefficient from the Randles-Sevcik equation. The equation is:

ip = (2.687 x 105) n3/2 A D1/2 C v1/2

I've some questions:

1) I used 6M NaOH electrolyte, then, 0.006 mol cm-3 is the C for this equation? 2) I used Ni foam (1 cm x 1 cm), so, 1 cm² is the value of A? I don't think 1 cm² is the correct one to use in the equation because I think A is related to electrochemically active surface area. How can I determine ECSA? 3) What is value of n? I think n is the number of electrons involved in redox processes such as Zn2+ – e- → Zn3+ here n is one or not?