Table 2.

Electrocatalytic properties comparison.

Catalyst	Onset potential (V)	Half-wave potential (V)	Current density (mA·cm−2)	References
CrN/GC	0.86	0.66	3.50	Zhao et al. (2015)
α-MnO2	0.79	0.76	5.90	Chen et al. (2018)
N-rGO	0.84	0.83	2.25	Liang et al. (2012)
MnCo2O4/rGO	0.845	0.86	2.75	Liang et al. (2012)
Pt/C	0.95	0.82	5.40	Khan et al. (2018d)
Cr/rGO without MnO	1.03	0.84	5.50	This work
Cr/rGO with MnO	1.05	0.89	5.90	This work

rGO, reduced graphene oxide.