Electrochemical Behavior of Dysprosium Ion and Its Co-Electroreduction with Nickel Ions in the Molten KCl-NaCl-CsCl Eutectic

The electrochemical behavior of dysprosium ions, as well and nickel ion co-reduction, on inert tungsten electrodes active were studied in the eutectic KCl-NaCl-CsCl melt at a temperature 823 K using methods cyclic square-wave voltammetry open circuit chronopotentiometry. process Dy3+ ions electroreduction was found to be reversible proceed within single three-electron stage up polarization rate 0.1 V/s. increase indicates slower charge transfer, which causes quasi-reversible character transfer. It is shown that when contains both curves have wave reduction potentials −(0.22–0.28) V −(2.175–2.250) relative chlorine-silver reference electrode. Apart from these waves, voltammograms two waves −(1.9–1.95) −(2.05–2.1) V. These are associated with their depolarization metallic nickel, preliminary deposited electrode, formation intermetallic phases various DyxNiy compositions. (E-t) dependencies chronopotentiometry elucidate plateaus potential delay, correspond dissolution separate phases. Based results changes circuit, series syntheses performed potentiostatic regime −(1.7–2.1) DyNi5, DyNi3 DyNi2 obtained definite ratio chloride concentrations K. synthesized samples characterized by X-ray diffraction scanning electron microscopy.