Fig. 4
a Cyclic voltammograms, b RRDE voltammograms, c plots of H2O2 yield, and number of electron transfer of a glassy carbon electrode modified with nanocomposite of AuNCs:RGO (1:1) at the rotation speed of 2500 rpm. Statistic results were based on data of three independent measurements. d LSV curves for nanocomposite of AuNCs:RGO (1:1) at the rotation rates of 100 to 2500 rpm. e The corresponding K–L plots for nanocomposite of AuNCs:RGO (1:1) at different potentials. f The corresponding tafel plots for nanocomposite of AuNCs:RGO (1:1) and commercial Pt/C catalyst. All measurements were conducted at a catalyst loading of 40.4 μg/cm2 in an O2-saturated 0.1 M KOH aqueous solution with a sweep rate of 10 mV/s