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The need for clean and renewable energy resources is increasing day by day. One of the most important of these resources is hydrogen, known as green energy. The most environmentally friendly method among hydrogen production processes is the electrolysis, in which pure hydrogen is obtained without any separation and purification processes. Carbon emissions is zero during production. The disadvantage of this method is that the production costs are high. For this reason, this study is aimed at improving a cathode material, which play a major role in the efficiency of electrolyzers. Electrochemically Ni, hydrothermally CoW and CoIr nanoparticles modified graphite electrodes are prepared as hydrogen evolution catalysts. The hydrothermally synthesized nanoparticles are impregnated on Ni-deposited graphite. The hydrogen evolution reaction activity of the prepared electrodes was investigated by electrochemical techniques. The cyclic voltammetry, linear sweep voltammetry, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques performed the electrochemical analyzes. The surface morphology and chemical composition of the synthesized nanoparticles were investigated using scanning electron microscopy, Energy-Dispersive X-ray spectroscopy and X-ray diffraction techniques. The catalytic efficiency is near for C/NiCoIr, and C/NiCoW electrodes, which has hydrogen volume of 108 and 105 mL cm−2 h−1 by electrolysis of water. [Display omitted] • C rod was prepared with Ni, CoW, and CoIr metals to investigate HER efficiency. • The C/NiCoW and C/NiCoIr nanoparticles were synthesized by hydrothermal method. • The catalyst efficiency for H 2 evolution was responsible for the synergistic effect. • The catalyst was exhibited excellent HER activity and high stability. [ABSTRACT FROM AUTHOR]