Abstract
The Ni+Mo composite coatings were prepared by electrodeposition under the galvanostatic conditions (jdep = -300 mA cm-2) from the nickel plating bath containing a suspension of molybdenum powder with different granulation (<100 nm, 3-7 μm, <150 μm). Kinetics of hydrogen evolution reaction (HER) was studied in 5 M KOH solution at room temperature using steady-state polarization and electrochemical impedance spectroscopy (EIS) measurements. It was found that the rate of the HER is dependent on the granulation of Mo powder used as composite component. The highest kinetics of the HER was revealed for the Ni+Mo (3-7 μm) composite electrode, and the increase in its electrochemical activity was attributed to the increase in the real surface area development and the intrinsic activity.
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