The redox reaction responsible for the OCP can in the most general terms, be described by Eq. 5a with 𝑄 being the O-upd charge, 𝑣 the scan rate, 𝑘 &'() being a characteristic rate constant, the unknown function 𝑓 &'() , the activity of free sites 𝑎 *+,,#-./,-(Eq. 5b), the activity of the O-upd 𝑎 &'() (Eq. 5c) using the symmetry coefficient 𝛼 and the interaction parameter 𝑚 &'() . The activity of protons, 𝑎 0 ! , is ignored in this study as it is conducted at constant pH. At sufficiently small scan rates, the left sides approach zero, which appears to be the case for scan rates ≤ 50 mV/s (Fig. , 1f), and one obtains the respective Nernst equation (Eq. 5e)