Activation of cathodic hydrogen evolution on manganese silicides in a sulfuric acid media, containing sodium fluoride

Authors

  • Igor S. Polkovnikov Perm State University
  • Viktoria V. Panteleeva Perm State University
  • Anatoly B. Shein Perm State University

DOI:

https://doi.org/10.17072/2223-1838-2024-3-90–98

Keywords:

manganese silicides, hydrogen evolution reaction, sodium fluoride, sulfuric acid

Abstract

The cathodic behavior of manganese silicides (MnSi and Mn5Si3) in 0,5 mol/l H2SO4 + (0–0,05) mol/l NaF solutions was studied. The degree of influence of fluoride ion concentration on the cathodic current density and the differential capacity of manganese silicides were calculated. It was concluded that in the presence of fluoride ions in the solution, activation of cathodic hydrogen evolution is observed, caused by partial dissolution of the oxide film (close in composition to SiO2), which is formed on the surface of the silicides at the corrosion potential. Compared with the fluoride-free electrolyte, the slope b in the Tafel equation decreases from ~0,17 V to ~0,09 V.

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Published

2024-12-25

How to Cite

Polkovnikov И. С., Panteleeva В. В., & Shein А. Б. (2024). Activation of cathodic hydrogen evolution on manganese silicides in a sulfuric acid media, containing sodium fluoride. Bulletin of Perm University. CHEMISTRY, 14(3). https://doi.org/10.17072/2223-1838-2024-3-90–98

Issue

Vol. 14 No. 3 (2024)

Section

Physical chemistry and electrochemistry

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