Tafel slopes of oxygen reduction, β_O2, obtained with the “mixed activation-diffusion control” fit for the polarization curves measured at 300 rpm (left) and 3,000 rpm (right). The Tafel slopes are shown as a function of the cathodic window, w_c, and for varying window activation control, w_ac, for a weight percentage, W (see Figure 3), of (a) 50%, (b) 70%, and (c) 90%. The black line represents the obtained results when the weight distribution is not applied. The black dashed lines show the Tafel slope of 0.24 V/dec obtained with the Tafel extrapolation technique for the “3,000 rpm aerated” curve.