@Habib i asked about areal specificcapacitance not about specific capacitance.
From CV curves, the areal capacitance (F/cm^2) at different scan rates is calculated according to the following equation:
C=(∫IdV)/( VνA), Where (I) is the current in the CV curve, (V) is the potential window, (ν) is the scan rate, and A is the area of the single electrode (cm^2).
From GCD curves, areal capacitance is calculated according to the following equation:
C = 2×I×t / (V×A), Where C is areal capacitance (F/cm^2), (I) discharge current, t is the discharge time (s), V represents the potential window (V), and A is the area of the single electrode (cm^2).
Hope this will help you!
@Muhammad R.Thaliji sir i deposited active material on the both sides of nickel foam of area 1 cm2. So i divide by capacitance by 1 or 2 to get areal specific capacitance ?
Waseem Raza You need to measure the total capacitance of the electrode first, using for example the method explained by Habib. You then calculate the areal capacitance by dividing the total electrode capacitance by the total area of the electrode, i.e. S, according to Mohammad's explanation. The total area is that of the electrode surface in conduct with the electrolyte, or that of the substrate surface covered by the active materials.
If you have coated your Ni foam on both sides, the total area, S, is then that of both sides. You said the area of the foam is 1 cm2, and I assume this is for one side only. If so, your total area is then 2 cm2 if your foam is very thin (e.g.
Watch this one... it will help
https://www.youtube.com/watch?v=KtYcY_20fbE&t=45s
Mohammad R. Thalji please if you have an article that used this method of (calculation of specific area capacitance) please give me its DOI
thank you in advance for your help.
Rima Ben Mammar you can check the followings;
1- DOI: 10.1039/C4TA06494A
2- https://doi.org/10.1039/C8TA07561A
3-DOI: 10.1002/adfm.201803196
4-DOI: 10.1002/adfm.202003721
Mohammad R. Thalji Thank you so much for your help i really appreciate it
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