Figure 1: Comparison of electrochemical characteristics of BASF-ETEK 30% Pt/C in 0.1 M HClO4, 0.1 M NaOH, and 1.0 M NaOH electrolytes. (a) CV in argon-saturated electrolytes, (b, c) Ring currents measured during ORR study at 900 rpm in O2-saturated electrolytes. Insets in (b, c) show the corresponding ORR polarization curves at 900 rpm. Scan rate: 20 mV/s. = 1.1 V versus RHE in 0.1 M NaOH and 1.3 V versus RHE in 0.1 M HClO4. Catalyst loading: 15  /cm2 on 5.61 mm Glassy Carbon disk electrode.