Electrochimica Acta, Vol.56, No.24, 8204-8218, 2011
Anodic dissolution of U, Zr and U-Zr alloy and convolution voltammetry of Zr4+vertical bar Zr2+ couple in molten LiCl-KCl eutectic
The anodic dissolution of U and Zr metal was studied in LiCl-KCl-UCl3 and LiCl-KCl-ZrCl4, respectively, at 773 K by cyclic voltammetry and compared with their respective dissolution behaviour in blank LiCl-KCl eutectic. The anodic dissolution of U-Zr alloy in LiCl-KCl-UCl3 was also studied at 773 K to compare with the dissolution of U and Zr. The transfer coefficients evaluated by Tafel analysis and the method of Allen-Hickling for U and Zr dissolution were found to be in fair agreement with each other. U dissolution in LiCl-KCl-UCl3 and Zr dissolution LiCl-KCl-ZrCl4 were also studied by chronoamperometry and the diffusion coefficient value of U3+ was calculated to be in the range of 2.9 x 10(-5) to 3.3 x 10(-5) cm(2) s(-1) which is in agreement with those reported in literature. Convolution voltammetric analysis of Zr4+/Zr2+ redox couple in LiCl-KCl-ZrCl4 was carried out for the first time to have a comprehensive understanding of the electrode kinetics. (C) 2011 Elsevier Ltd. All rights reserved.
Keywords:Molten salt electrorefining;Anodic dissolution;Chronoamperometry;Tafel plot;Convolution Voltammetry