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Title: Electrochemical Impedance Spectroscopy and Cyclic Voltammetry Methods for Monitoring SmCl3 Concentration in Molten Eutectic LiCl-KCl

Journal Article · · Journal of Nuclear Fuel Cycle and Waste Technology
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Boise State Univ., ID (United States)
  3. Univ. of Utah, Salt Lake City, UT (United States)
  4. Virginia Commonwealth Univ., Richmond, VA (United States)
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Molten salt solutions consisting of eutectic LiCl-KCl and concentrations of samarium chloride (0.5 to 3.0 wt%) at 500 C were analyzed using both cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The CV technique gave the average diffusion coefficient for Sm3+ over the concentration range. Equipped with Sm3+ diffusion coefficient, the Randles-Sevcik equation predicted Sm3+ concentration values that agree with the given experimental values. From CV measurements; the anodic, cathodic, and half-peak potentials were identified and subsequently used as a parameter to acquire EIS spectra. A six-element Voigt model was used to model the EIS data in terms of resistance-time constant pairs. The lowest resistances were observed at the half-peak potential with the associated resistance-time constant pairs characterizing the reversible reaction between Sm3+ and Sm2+. By extrapolation, the Voigt model estimated the polarization resistance and established a polarization resistance-concentration relationship.

Research Organization:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1631811
Report Number(s):
INL/JOU-15-34095-Rev000; TRN: US2201259
Journal Information:
Journal of Nuclear Fuel Cycle and Waste Technology, Vol. 18, Issue 1; ISSN 1738-1894
Publisher:
Korean Radioactive Waste SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
molten salt
electrochemical impedance spectroscopy
cyclic voltammetry
concentration
samarium chloride