The value of the obtained rate constant (𝑘 = 15-20 µmol/cm 2 s), corresponding to a maximum equivalent dissociation current at an empty metallic surface of > 1 A/cm 2 . This value is sufficient to sustain the ORR activity in common applications. Additionally, the deduced power law as the description of the potential-charge relationships (Eq. 5) and free reaction sites (Eq. 9a) suggests that the ubiquitous usage of Langmuir-isotherms used for such purpose should be revisited (Fig. ) as well: It is likely that at least on polycrystalline surfaces, the binding energy distribution of reactant/adsorption sites is so complex that it can only be described by power laws with empirically determined parameters. While this result provides compelling evidence for the dissociative path being the dominant reaction mechanism of the ORR, the associative mechanism may still be faster and dominant overall. Consequently, it needs to be investigated if the dissociative mechanism can predict typical ORR activities.