what is the effect the thickness of electrode material on capacitance value of Supercapacitor ,n my works as decrease the thickness of electrode the capacitance increase?
Specific capacitance is measured against the amount of active material loaded, i.e., unit of capacitance is F/g. In other case, capacitance is calculated against the area of the electrode surface, i.e., the unit is F/cm2.
If one increase the thickness, meaning that the amount of loaded material increase. In the case of non-porous material, underlying materials that are not exposed to the solution may not take part in the charging process or may not undergo redox reaction in case of pseudocapacitance. The thick film with high mass would naturally divide the experimental capacitance value, while thin film with low mass would also divide the experimental capacitance that would be very similar to that obtained with thick film. These ultimately result in low capacitance with thick surface. On the other hand, no effect would be found if the capacitance is normalized with the surface area, i.e., F/cm2.
MMI
Hi Allan Daraghmeh,
As far as I understand, at decreasing electrode thickness you obtain higher specific capacity? If so, you should know that the big thickness of electrode leads to current distribution worsening i.e. thick electrode will not work inside of it (especially under high currents). This is a reason that also define electrode thickness in real accumulators and batteries - in them thickness of electrode not excess 2-3 mm. It is due to a inner space of electrode, that does not work.
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