▎ 摘　　要

In this study, composite coatings of Ni-Fe-Co-graphene were successfully produced via electrodeposition on a steel substrate from sulfate acidic bath under different conditions. Findings showed that the incorporation of graphene could improve the electrocatalytic activity of the coatings for hydrogen evolution reaction (HER) in an alkaline environment. As indicated by linear sweep voltammetry and electrochemical impedance spectroscopy measurements in 6 M KOH, the best coating (graphene concentration of 0.2 g L-1) presented a low overpotential (169 mV at 10 mA cm(-2) ), high exchange current density (272.3 mu A cm(-2)), and large electrochemical surface area (686.5 cm(2)). Tafel slope analysis showed that HER occurred on the composite coatings via the Volmer-Heyrovsky mechanism. Relevant conclusions were validated by scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction, and electrochemical workstation.