Electrochemical behaviour of dysprosium in the eutectic LiCl–KCl at W and Al electrodes

摘要: The electrochemical behaviour of DyCl3 was studied in the eutectic LiCl-KCl at different temperatures. cathodic reaction can be written:Dy(III) + 3e ↔ Dy(0)which divided two very close steps:Dy(III) 1e Dy(II) and 2e Dy(0) Transient techniques, such as cyclic voltammetry, chronopotentiometry, chronoamperometry were used order to study mechanism transport parameters electroactive species a tungsten electrode. results showed that LiCl-KCl, electrocrystallization dysprosium seems controlling step. Chronoamperometric studies indicated instantaneous nucleation with three dimensional growth nuclei whatever applied overpotential. Mass towards electrode is simple diffusion process, coefficient species, i.e. Dy(III), has been calculated. validity Arrhenius law also verified by plotting variation logarithm versus 1/T. In addition, reactions LiCl-KCl-DyCl3 solutions an Al wire investigated voltammetry open circuit chronopotentiometry. redox potential Dy(III)/Dy couple observed more positive potentials values than those inert This shift thermodynamically analyzed lowering activity Dy metal phase due formation intermetallic compounds. © 2004 Elsevier Ltd. All rights reserved.