Four-electron ORR catalyst.

Catalyst	Electrolyte	Half-wave potential	Stability	Ref.
Fe–B–Co/NC	0.1 M KOH	0.891	5 h	181
OHEA-mAC	0.1 M KOH	0.9	10 000 cycles	182
Pt@Pt–Pt3Ni	0.1 M HClO4	0.9	50 000 cycles	183
Meso-/micro-FeNSC	0.1 M KOH	0.91	200 h	184
Zr–Zr3O/NC	0.1 M KOH	0.914	20 000 cycles	185
K–N–C	0.1 M KOH	0.908	10 000 cycles	186
S–Cu-ISA/SNC	0.1 M KOH	0.918	50 h	187
N–Pt/HEA/C	0.1 M HClO4	0.924	100 h	188
FeSA/N,S-PHLC	0.1 M KOH	0.91	882 h	189
FeMo–N6	0.1 M HClO4	0.84	0.27 h	190
Fe SAC-MOF-5	0.5 M H2SO4	0.83	10 000 cycles	191
FeSAs/NSC-vd	0.1 M KOH	0.92	13.8 h	192
Mf-pClNC	0.1 M KOH	0.91	100 000 cycles	193
FeRu–N–C	0.1 M HClO4	0.86	50 000 cycles	194