Electrochemical activity of electroless Ni-P coatings in the hydrogen evolution reaction

Keywords: Electroless Ni-P coating, Electrochemical activity, Hydrogen evolution reaction, Roughness factor, Electrode capacitance

Abstract

The purpose of this study was investigation of the electrochemical activity of Ni-P coatings, differing in phosphorus content and structure, in the hydrogen evolution reaction (HER) and the identification of the reasons for their high activity in the reaction being studied.

The coatings were deposited from an electroless nickel plating solution, the phosphorus content in the coatings (from 4.8 to 8.0 wt. %) varied by changing the pH of the solution. It was found that during cathodic polarization in 0.5 M H2SO4 additional surface activation occurs as a result of dissolution of the surface layer of the coating, removal of phosphorus from the surface layer, and development of the electrode surface. Of all the coatings studied coatings containing 4.8% phosphorus were most susceptible to cathodic activation. Coatings with a phosphorus content of 8.0% were least susceptible to cathodic activation.

The similar electrochemical activity of the studied coatings (taking into account the roughness factor) in HER indicates that, as a result of cathodic polarization, the composition of the thin surface layer on which the cathodic reaction occurs is approximately the same, regardless of the initial phosphorus content

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Author Biographies

Igor V. Petukhov, Perm State University, 15 ul. Bukireva, Perm 614990, Russian Federation

Cand. Sci. (Chem.), Associate
Professor at the Department of Physical Chemistry,
Perm State University, (Perm, Russian Federation)

Vladimir I. Kichigin, Perm State University, 15 ul. Bukireva, Perm 614990, Russian Federation

Cand. Sci. (Chem.), Research
Fellow, Research Fellow at the Department of Physical
Chemistry, Perm State University (Perm, Russian
Federation)

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Published
2024-01-31
How to Cite
Petukhov, I. V., & Kichigin, V. I. (2024). Electrochemical activity of electroless Ni-P coatings in the hydrogen evolution reaction. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 26(1), 117-126. https://doi.org/10.17308/kcmf.2024.26/11815
Section
Original articles