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V. Constantin, A. M. Popescu, M. Olteanu. Electrochemical studies on cerium (III) in molten fluorides. Journal of Rare Earth, 28, (3), pp. 428-434, 2010.

Abstract: This study aims to determine the principal electrochemical characteristics of the electrodeposition of cerium metal from molten
fluoride systems. The cathodic process of Ce3+ ions in LiF-NaF and LiF-NaF-CaF2 molten salts was studied using electrochemical techniques
as steady state and cyclic voltammetry methods. The decomposition potential (Ed) and the overvoltage(􀁋) were determined for NaCeF4 using
current-potential curves under galvanostatic conditions. The Ed was found to be 2.025 V in LiF-NaF and 2.045 V in LiF-NaF-CaF2. It was
also found that the ohmic drop potential (E􀀺) was not dependent on NaCeF4 concentration and it rose as the current intensity increased. The
overvoltage (􀁋) was determined from the polarization curves and the Tafel coefficients and kinetic parameters were calculated on the assumption
that the process constitutes of direct discharge of Ce3+, with no solvent-solute interaction. In order to elucidate the cathodic process the
investigation by cyclic voltammetry technique was finally used. From the evolution of the voltammograms we concluded that the electrochemical
reduction of Ce3+ ion was actually a reversible process on the molybdenum electrode and cathodic reduction of Ce3+ took place in
one single step involving three electron exchanges.

Keywords: molten salts,rare earth

Posted by Virgil Constantin


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