Do the chronopotentiometry in the 3 electrode setup and from the curve calculate the capacity by using ( current* time/ mass of electrode)

Dear Dumindu,

You can calculated the capacitance as mention by Mr. Zahid and specially by Dr. Campos.

But from cyclic voltammetry also you can get the capacitance by integrating the CV area and divided by scan rate.

Best Regards,

Bapi

one way is impedance spectroscopy.

Dear Dumindu,

I agree with the answers above. Both techniques are possible: CV and EIS. In the case of CV, you have to measure the current in a place where there is only capacitive current. Then, this current is v.C (scan rate multiplied by the capacity) and you can extract the capacity. You have to record the CV in a solution without electroactive species (without faradaic contribution to the current)

Good luck,

Teresa

Both methods are applicable. With one addition: it is necessary to know mass of active electrode and fraction of the substance whose electrochemical capacity you want to determine. That is, you need to weigh the components before slurry preparing, as well as the electrode (minus substrate). The resulting capaty value should be divided by the mass of the active substance [mA*hrs/g].

Thank you very much.