Figure 7

(a) ORR curves for GC disk coated with 20 µg_Pt cm⁻². The ORR curves were measured at 10 mV s⁻¹, 1600 RPM, 60 °C and 0.1 M KOH. The grey dot shows a point where the value of limiting current is defined. (b) The corresponding TP (bottom), DTP (middle) and ECP (top).