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

Electroanalysis - Tập 28 Số 9 - Trang 2158-2165 - 2016
Cynthia A. Schroll1, Sayandev Chatterjee2, Tatiana G. Levitskaia2, William R. Heineman1, Samuel A. Bryan2
1Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
2Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99352

Tóm tắt

AbstractKey electrochemical properties affecting pyroprocessing of nuclear fuel were examined in four eutectic melts using Eu3+/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 Eu3+/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 Eu3+/2+ was not affected by melt composition.

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Electroanalysis

Tập 28 Số 9

2158-2165

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