Comparison of the specific activity (SA) of SAzymes and natural enzymes.

Sample	Metal atom loading	SA (U mg−1)	Ref.
Fe–N–C SAzymes	13.5 wt%	25.33	65
Co–N–C SAzymes	—	6.33
Zn–N–C SAzymes	—	2.46
Fe SAEs	1.2 wt%	6.75	78
Fe3O4	—	0.17
N–C	—	0.04
Fe–N–C SAN	1.85 at%	57.76	67
Natural HRP	—	327a
		297b

^aManufacture's value.

^bMeasured using the protocol.