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

Key electrochemical properties affecting pyroprocessing of nuclear fuel were examined in four eutectic melts using 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 redox 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, redox potentials and diffusion coefficients for Eu3+ in each eutectic melt. The redox potentials determined by thin-layer spectroelectrochemistry were extremely close to those obtained using cyclic voltammetry. The redox potential for Eu3+/2+ was most positive in the 3 LiCl - NaCl melt, showed a negative shift in the 3 LiCl - 2 KCl melt, and was the most negative in the LiCl - RbCl and 3 LiCl - 2 CsCl eutectics. The diffusion coefficient for Eu3+ followed this same trend; it was the largest in the 3 LiCl - NaCl melt and the smallest in the LiCl - RbCl and 3 LiCl - 2 CsCl melts. The basic one-electron reversible electron transfermore » for Eu3+/2+ was not changed by melt composition.« less
 [1] ;  [2] ;  [2] ;  [1] ;  [2]
  1. Department of Chemistry, University of Cincinnati, Cincinnati OH 45221-0172
  2. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland WA 99352
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1040-0397; AF5805010
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electroanalysis; Journal Volume: 28; Journal Issue: 9
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
Country of Publication:
United States
pyroprocessing; molten salt; electrochemistry; spectroelectrochemistry; lanthanides