Panteleeva V.V.

ANODIC PROCESSES ON NiSi ELECTRODE IN SODIUM HYDROXIDE SOLUTIONS

Anodic behavior of NiSi in (0.1 – 5.0) M NaOH in the range of potentials from corro-sion potential up to oxygen evolution potential was studied using methods of polarization and impedance measurements. It was concluded that in the alkaline electrolyte the selective disso-lution of silicon from the nickel silicide occurs. High chemical resistance of NiSi is due to the formation on its surface the passivating film, consisting mainly from poorly soluble products of anodic oxidation of nickel (it may also include a small content of silicon dioxide and sili-cates). The equivalent electrical circuit modeling the passive state of the silicide was pro-posed.

Key words: nickel silicide, passivation, alkaline electrolyte, impedance

2016, Т. 59, № 2, Стр. 64-69

ANODIC OXYGEN EVOLUTION ON IRON, COBALT AND NICKEL SILICIDES IN ALKALINE ELECTROLYTE

The kinetics of oxygen evolution reaction on iron, cobalt and nickel monosilicides in (0.1 – 5.0) M NaOH was studied using methods of polarization and impedance measurements. The values of deriva-tives dE/dlgi, dlgi/dpH, dE/dpH were determined. The oxygen evolution on FeSi, CoSi and NiSi elec-trodes in alkaline solution was established to have regularities which are characteristic to Fe, Co and Ni electrodes, respectively.
Key words: oxygen evolution reaction, iron silicide FeSi, cobalt silicide CoSi, nickel silicide Ni-Si, alkaline electrolyte, impedance

2016, Т. 59, № 1, Стр. 57-63
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