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

Table 1

Atom concentration of Co, O, and P in the Co-P precursor and in Co-Pi/CoP and Co_xO_y.

	C	Co	P	O
Co-P precursor	47.46	9.87	9.92	32.75
Co-Pi/CoP	48.26	11.08	16.89	23.77
CoxOy	46.54	10.33	1.04	42.09