F or V-induced activation of (Co, Ni) 2 P during electrocatalysis for efficient hydrogen evolution reaction

A series of (Co, Ni) 2 P– x F and post-(Co, Ni) 2 P– x F electrocatalysts with different compositions, morphologies and HER performances were synthesized. Among them, post-(Co, Ni) 2 P–10F exhibits the best HER activity.