Comparison of Electrochemical Properties of Ni+MoS₂ and Ni Coatings in an Alkaline Solution

Abstract:

The Ni+MoS₂ composite coatings were obtained by electrolytic co-deposition of crystalline nickel with molybdenum sulfide powder from an electrolyte containing suspension of this powder. For comparison, the Ni coating was also deposited. These coatings were obtained in galvanostatic conditions at the current density of j_dep = -250 mA cm^-2. A scanning electron microscope was used for surface morphology characterization of the coatings. The behavior of the coatings was investigated in the process of hydrogen evolution reaction from 5 M KOH solution using steady-state polarization and electrochemical impedance spectroscopy methods. It was found that introduction of molybdenum sulfide into nickel matrix, evokes developed and rough surface which is the reason for the increase in the rate of the HER as comapred to the smooth Ni electrode. Thus obtained coatings may be useful in application as electrode materials for the HER.

• Periodical: Solid State Phenomena (Volume 228)
• Pages: 225-230
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.228.225
• Online since: March 2015
• Authors: Magdalena Popczyk, Bożena Łosiewicz
• Keywords: Hydrogen Evolution Reaction, Ni Coatings, Ni+MoS₂ Composite Coatings

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