Effect of Molybdenum(IV) Oxide on the Process of Hydrogen Evolution on Ni+Mo Electrolytic Composite Coatings

Abstract:

The Ni+Mo and Ni+MoO₂+Mo composite coatings were electrodeposited at the constant deposition current density of j_dep = -200 mA cm^-2 from the nickel plating bath containing powder of Mo or MoO₂ and Mo. The investigations of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature using steady-state polarization and electrochemical impedance spectroscopy (EIS) techniques. It was found that for the Ni+MoO₂+Mo composite coating the increase in the activity of HER was observed in comparison with Ni+Mo composite coating probably due to the more porous surface and presence of additional composite component (MoO₂) in the nickel matrix.

• Periodical: Solid State Phenomena (Volume 228)
• Pages: 277-282
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.228.277
• Online since: March 2015
• Authors: Magdalena Popczyk*, B. Łosiewicz
• Keywords: Hydrogen Evolution Reaction, Molybdenum, MoO₂, Ni+Mo Composite Coating, Ni+MoO₂+Mo Composite Coating

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