Please go through the attached paper. May help.

overpotential = (Experimental - thermodynamic)potential.

Say, OER, the thermodynamic potential for OER is 1.23 V (vs SHE) and your obtained OER potential (onset) is 1.63 V, then the overpotential of OER for your material will be (1.63-1.23)V = 0.4 V.

Thanks a lot sujoy sir. once again,i would like to know this common method to calculate overpotential or any other methods/techniques available.

In electrocatalysis, people usually use this equation to find out the overpotential. In Butler-Volmer equation, overpotential (ita) is defined as E - Eeq.

Thank you sir for your valuable suggestion.

Dear, Sujoy Sarkar,

I want to calculate overpotential for ORR, then what will be the thermodynamic potential for ORR?

Dear Anand,

Standard thermo. potential for oxygen reduction is 1.23 V

Good luck...!

Thanks Brother Indrajit M. Patil,

Please provide me any reference. I will be thankful.

Please go through the attached paper. May help.

Thank you so much Suryakanti Debata.

Thank you Sujoy Sarkar

for

overpotential = (Experimental - thermodynamic)potential