Hydrogen evolution reaction on Co₃₀Ni₇₀, Co ₃₀Mo₇₀, Ni₃₀Mo₇₀, and Co ₁₀Ni₂₀Mo₇₀ alloy powders produced by mechanical alloying

Nanocrystalline Co₃₀Ni₇₀, Co₃₀Mo ₇₀, Ni₃₀Mo₇₀, and Co₁₀Ni ₂₀Mo₇₀, metallic powders were prepared by mechanical alloying and characterized by linear polarization in 30 wt% KOH aqueous solution at room temperature on the hydrogen evolution reaction (HER). The electrochemical behavior was related to the characteristics of enhanced solubility, morphology and nanometric grain size exhibited by the mechanically alloyed powders. X-ray diffraction analysis and scanning electron microscopy of alloyed powders showed the presence of two phases; an fee solid solution and intermetallic compounds of Ni, Co and Mo. The linear sweep voltammograms confirmed these results. The Co₃₀Ni₇₀ alloyed powders showed the best catalytic activity for HER.