▎ 摘　　要

FeCoxNiyB nanoparticles with tuned cationic ratio integrated on Vertically Aligned Boron-doped Graphene Array (FeCoxNiyB@B-VG) electrocatalysts towards water splitting are successfully prepared by electroless plating. For a specific composition, FeCo66.7Ni33.3B@B-VG electrocatalyst exhibits the highest electrocatalytic activity towards hydrogen evolution reaction, with low overpotentials of 125 and 157 mV at eta (10) and small Tafel slopes of 52 and 47 mV dec(-1) in 1.0 M KOH and 0.5 M H2SO4 solution, respectively. FeCo66.7Ni33.3B@B-VG electrocatalyst displays remarkable catalytic activity towards oxygen evolution reaction by showing low overpotentials of 200 and 569 mV at eta (10) and small Tafel slopes of 34 and 225 mV dec(-1) in 1.0 M KOH and 0.5 M H2SO4 solution, respectively. The result of stability test exhibits that FeCo66.7Ni33.3B@B-VG electrocatalyst has long-term stability for at least 10 h towards water splitting in a wide pH range. And the faraday efficiency of FeCo66.7Ni33.3B@B-VG towards water splitting is around 90%. This study helps to explore the effect of variable cationic ratio in the fabrication of non-noble electrocatalyst to achieve enhanced electrocatalytic activity for water splitting in a wide pH range.