Electrodeposited Ni-W nanoparticles: Enhanced catalytic activity toward hydrogen evolution reaction in acidic media

•Ni-W nanoparticles were uniformly electrodeposited on FTO substrate.•The electrocatalytic properties were evaluated in acidic media for HER.•The catalyst showed a current density of 10 mA.cm−2 at −205 mV vs. RHE.•An improved stability and response were observed compared with Ni nanoparticles.•The Volmer reaction was identified as the rate determining step for HER. Electrocatalytic production of hydrogen through non-precious metals is of great importance. While Ni and its alloys show a good catalytic activity in alkaline solutions, their poor response and stability in acidic electrolytes is yet a challenge. Herein, we report on the electrodeposition of Ni-W nanoparticles (NPs) with the aim of electrocatalytic enhancement of nickel material in acidic media for hydrogen evolution reaction (HER). The catalyst showed a high current density of 10 mA.cm−2 at −205 mV (vs. RHE) for HER and an improved stability compared to that of tungsten-free Ni NPs. The high catalytic activity of Ni-W NPs stems from incorporation of the tungsten atoms into the nickel structure. The results are promising for developing of highly efficient, earth-abundant and inexpensive Ni-based cathodes for HER.