Room-Temperature Preparation of Cobalt-Based Electrocatalysts through Simple Solution Treatment for Selectively High-Efficiency Hydrogen Evolution Reaction in Alkaline or Acidic Medium

Table 2

HER performances of Co-Pi/CoP, Co_xO_y, and other reported electrocatalysts (: current density; : overpotential).

Catalyst	Media	(mA/cm^2)	(mV)	Tafel slope (mV dec^−1)	Ref.
CoxOy	1 M NaOH	10	80	110.1	This work
Co-Pi/CoP	0.5 M H2SO4	10	112	99.8	This work
Cobalt phosphide/phosphate thin film (PCPTF)	1 M KOH	30	430	—	[28]
	0.5 M H2SO4	30	175	53
NiFeOx/CFP	1 M KOH	10	88	118	[41]
Co-P film	1 M KOH	10	94	120	[42]
Ni/NiP	1 M KOH	10	130	106	[43]
Ni5P4 films	1 M KOH	10	150	59	[44]
	0.5 M H2SO4	10	140	40
Co3O4	1 M KOH	10	~260	—	[45]
Ni(OH)2–CoS2/CC	1 M KOH	20	99	118	[46]
Co(OH)2@PANI HNSs/NF	1 M KOH	10	88	91.6	[37]
Ni(OH)2/MoS2@CC	1 M KOH	10	80	60	[47]
CoPt@Co(OH)2	1 M KOH	10	~150	73	[48]
Ni(OH)2–Fe2P/TM	1 M KOH	10	76	105	[49]
CoS-Co(OH)2@aMoS/NF	1 M KOH	10	140	68	[36]