Comparison of Electrocatalytic Activity of the Composite Ni-P+NiO and Ni-P+Ni(OH)₂ Coatings for Hydrogen Evolution

Abstract:

The object of this work were composite electrocoatings with an amorphous Ni-P matrix containing crystalline NiO or Ni (OH)₂ component. The Ni-P+NiO, Ni-P+Ni (OH)₂ and Ni-P electrocoatings were deposited on a Cu substrate under galvanostatic conditions at room temperature. The electrocatalysts were characterized in the process of hydrogen evolution in 5 M NaOH solution in dependence on their deposition conditions, phase composition and chemical constitution. Based on the potentiodynamic polarization curves, the parameters of the Tafel equation and exchange current densities, were determined as a criterion for estimation of catalytic properties of these electrode materials towards hydrogen evolution reaction in an alkaline medium.

• Periodical: Solid State Phenomena (Volume 228)
• Pages: 213-218
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.228.213
• Online since: March 2015
• Authors: B. Łosiewicz*, Magdalena Popczyk
• Keywords: Composite Electrocatalysts, Hydrogen Evolution Reaction, Ni-P+Ni(OH)₂, Ni-P+NiO

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