I want to calculation of sensor sensitivity. it is described by calibration curve slope/active surface area. but I don't know how i can determine active surface area
Hi
You should perform a Chronocoulometry technique in a Potassium ferricyanide buffer.
Here is the simple protocol:
4.1. Determination of Surface Area of the Electrode
This first step is used to determine the area of the electrode. First the student will add the 2 mM K3Fe(CN)6solution to the electrochemical cell. Insert the working, reference and auxiliary electrodes into the cell. Attach the green clip to the working electrode, the white to the reference and the red to the auxiliary electrode. Under “setup in the menu, select “Technique” and “Chronocoulometry”. Set the following parameters under “Parameters:” Initial Potential: 0.0V; Final Potential: 0.8V; Number of steps: 2; Sensitivity: 1e-6 A/V. Record a chronocoulometric plot for the solution. Repeat two more time for three trials total.
from:
http://article.sapub.org/10.5923.j.jlce.20130103.02.html#Sec4.1
Mr. Azimzadeh,
thank you very much for your answer. I have solved this problem.
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