Figure 3

RRDE experiments with a BG disk response pre-reduced at −1.0 V for 60 s in Ar deaerated 0.5 M NaOH at 5 mV.s⁻¹ and rotated at 1600 rpm. The Pt ring potential was fixed at − 0.45 V for O₂ detection. Solid and dashed lines denote first and second cycles, respectively.