Fig. 8
a CV curves of m-Fe/N/C-900 in N2 vs O2-saturated 0.1 M KOH solution. b CV curves of m-Fe/N/C-800, m-Fe/N/C-900, and m-Fe/N/C-950 in O2-saturated 0.1 mol l-1 KOH solution. c Disk and ring currents obtained with LSVs on RRDE for m-Fe/N/C-800, m-Fe/N/C-900, and m-Fe/N/C-950 in O2-saturated 0.1 mol l-1 KOH solution. d The corresponding electron transfer numbers and H2O2 yields of m-Fe/N/C-800, m-Fe/N/C-900, and m-Fe/N/C-950 derived from c