The electrochemical reduction of Dy 2 O 3 in CaCl 2 melt was studied. The cyclic voltammetry, chronoamperometry, AC impedance and constant voltage electrolysis were employed. A single cathodic current peak in the cyclic voltammogram and one response semicircle in the AC impedance spectrum were observed, supporting a one-step electrochemical reduction mechanism of Dy 2 O 3 . No intermediates were observed by XRD, which confirmed the following electrochemical reduction sequence: Dy 2 O 3 ? Dy. The charge transfer resistances and the activation energies involved in the electrochemical reduction step of Dy 2 O 3 were obtained by simulating the AC impedance spectra with equivalent circuits. The electrochemical reduction reaction of Dy 2 O 3 is controlled by the charge transfer process at a low voltage range and by the diffusion process at a high voltage range.
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