How do I take the working electrode area to calculate current density in cyclic voltammetry measurement as my sample is a powder sample and I dispersed it on 3mm diameter glassy carbon electrode.
Hello Gourav Singla,
Assuming that your powder is uniformly distributed across the glassy carbon electrode you can consider the area of your supporting electrode (3mm diameter glassy carbon). The surface area of your powder will be higher than that of course but you only want to take into account the exposed area of your powder which corresponds to the first layer of powder (around the same area as the supporting electrode plus roughness).
The roughness can be significant depending on your particles and you can study that by SEM or AFM. If you want to be really accurate you can measure the roughness of some parts of your sample and use the average roughness to determine the total exposed area.
On the other hand, if your sample is really porous you can determine the porosity and determine the area from that.
Hope this helped.
João Azevedo how do we calculate the geometric area of glassy carbon if we know it,s diameter
Muhammad Umair A=π r2
A GCE of 3 mm diameter has a geometric surface area of 0.07 cm2.
Cheers
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