Abstract : As a part of partitioning studies, the experiments of cyclic voltammetry and electrolytic reduction
with the liquid bismuth cathode were conducted to investigate electrochemical behaviours of
lanthanide elements in the electrorefining system employing LiF-NaF-KF eutectic salt as the
electrolyte. The cyclic voltammograms for NdF3 and GdF3 were obtained at various potential scan
rates, respectively. The cathodic and anodic peak currents of the elements increased in proportion to
the square root of the potential scan rate. According to changes of the potential difference between the
coupled cathodic and anodic peaks, reversibilities of the reduction-oxidation reactions in this system
were evaluated. In addition, further behaviours of electrochemical reaction of the elements were
examined through electrolytic tests of the system using liquid bismuth as the cathode at fixed current
densities.
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