i had ran the chrono Coulometry experiment in 10 mM ferri cyanide solution
in the CH instrument i got following results
forward
slp= -2.889e-5
Int= -2.943e-5
cor= -0.99932
Reverse
slp= 2.905e-5
Int= 4.261e-5
cor= 0.99963
how to find the surface area of the electrode????
please explain......
First of all, add more information to your question and explain how you processed the data. Second, Potential-step chronocoulometry can give you geometric area of an electrode, not true area. Check out general texts on electrochemistry.
You can use Cottrell equation
i = (2nFAD^1/2Ct^1/2)/π^1/2
You have already plotted the graphs and calculated the slopes. From either slope you can find out electrochemical active surface area
Slope is 2nFACD^1/2π^ -1/2
n, F, C, and D are the number of electrons transferred (in this case n=1) Faraday constant (in Coulombs/mole), concentration of analyte in solution (in moles/cm3) and diffusion constant of the analyte (in cm2/s-1)
In general for ferricyanide D is 7.6 x 10^-6 cm2/s
Hope this information will help you.
Use the Anson plot and the Anson equation. Get A from the slope.
https://www.researchgate.net/profile/Bhushan_Patil2
Dear Bhushan,
Please provide the reference for ferricyanide D = 7.6 x 10^-6 cm2/s.
Thnaks
Mangesh
Dear Mangesh,
Sorry for late reply,
Please find attached file for diffusion coefficient of ferricyanide
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