From early studies of ORR on Pt electrodes in liquid electrolyte, Damjanovic and Brusic proposed the following kinetic expression highlighting the dependency of ORR kinetic current (i_O_R_R_) on proton activity/concentration [36]: i_O_R_R_ = k_ P_O_2_n_ H_ m_ e_x_p_(− α_ F_R_T_ η_O_R_R_) (3) where k is the electrochemical rate constant akin to exchange current density, n and m are reaction order stated to be 1 and 1.5 [36], α is transfer coefficient, p_O_2_ is oxygen partial pressure, η_O_R_R_ is ORR overpotential, F is Faraday constant, R is universal gas constant, and T is temperature.