What the best way to find the find the electrochemical capacitance of the catalyst?

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Bapi Bera

Dear Vishal Vats ,

From my point of view impedance spectroscopy is the best option to calculate the capacitance.

Best Regards,

Bapi

Vishal Vats

while using EIS how to use the correct circuit while fitting the nyquist curve.

Those thing depends on which system (which condition, reaction, etc) you are using and what kind of EIS data are getting.Then only you can choose the correct circuit.

Mahedi Hasan

Typically an EIS plot contains a semicircle and a straight line. If your EIS data is similar then you can use a simplified Randels circuit consisting of a solution resistance, a charge transfer resistance, warburg resistance and a constant phase element. You can find the capacitance from this circuit.