Table 5.

ORR performance parameters of the obtained N-doped activated carbons and commercial Pt/C catalysts tested in alkaline media.

Catalyst	Ep (V vs. RHE)	Eonset (V vs. RHE)	E1/2 (V vs. RHE)	Diffusion-Limiting Current (mA cm−2)	n (0.5 V)
Pt/C	0.76	0.98	0.88	6.37	4.00
AC–O-raw	0.73	0.77	0.71	2.93	2.81
AC–O-I	0.69	0.74	0.66	3.30	3.09
AC–O-II	0.70	0.75	0.66	2.99	2.77
AC–KB-raw	0.73	0.79	0.72	3.44	2.84
AC–KB-I	0.75	0.81	0.75	2.99	2.51
AC–KB-II	0.72	0.76	0.71	2.80	2.43
AC–N-raw	0.75	0.81	0.75	2.36	2.11
AC–N-I	0.68	0.80	0.69	2.10	2.21
AC–N-II	0.72	0.82	0.73	1.72	1.95