My screen printed electrode CV is given here. For Nerstean one electron reaction the delta E value should be close to 57 mV and ration of Ic/Ia should be close to 1. I did CV of my screen printed electrode using 3 mM ferricyanide ferrocyanidehe solution in PBS pH 7.4, the delta E value is 400 mV which is greater than 57 mV and Ic/Ia =0.95 which is close to one. Now how to interpret that the reaction is reversible, quasireversible or irreversible? How to know number of electron transfer?. I used Zensor screen printed electrode and scan rate of 100 mV/s.