Spectroelectrochemistry of EuCl₃ in Four Molten Salt Eutectics; 3 LiCl−NaCl, 3 LiCl−2 KCl, LiCl−RbCl, and 3 LiCl−2 CsCl; at 873 K

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• 作者：Cynthia A. Schroll ; Sayandev Chatterjee ; Tatiana Levitskaia ; William R. Heineman and Samuel A. Bryan
• 刊名：Electroanalysis
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：28
• 期：9
• 页码：2158-2165
• 全文大小：1204K
• ISSN：1521-4109

文摘

Key electrochemical properties affecting pyroprocessing of nuclear fuel were examined in four eutectic melts using Eu^3+/2+ as a representative probe. We report the electrochemical and spectroelectrochemical behavior of EuCl₃ in four molten salt eutectics (3 LiCl−NaCl, 3 LiCl−2 KCl, LiCl−RbCl and 3 LiCl−2 CsCl) at 873 K. Cyclic voltammetry was used to determine the reduction potential for Eu^3+/2+ and the applied potentials for spectroelectrochemistry. Single step chronoabsorptometry and thin-layer spectroelectrochemistry were used to obtain the number of electrons transferred, reduction potentials and diffusion coefficients for Eu³⁺ in each eutectic melt. The reduction potentials determined by thin-layer spectroelectrochemistry were essentially the same as those obtained using cyclic voltammetry. The diffusion coefficient for Eu³⁺ was the largest in the 3 LiCl−NaCl melt, showed a negative shift in the 3 LiCl−2 KCl melt, and was the smallest in the LiCl−RbCl and 3 LiCl−2 CsCl eutectic melts. The basic one-electron reversible electron transfer for Eu^3+/2+ was not affected by melt composition.