Fig. 9
a Disk and ring currents obtained with LSVs on RRDE for m-Ni/N/C-900, m-Cu/N/C-900, and m-Fe/N/C-900 in O2-saturated 0.1 mol l-1 KOH solution. b The corresponding electron transfer number and H2O2 yield of m-Ni/N/C-900, m-Cu/N/C-900, and m-Fe/N/C-900 derived from a. c CV curves and d LSV curves of m-Fe/N/C-900 before and after continuous scanning for 5000 cycles in O2-saturated 0.1 M KOH solution