Journal of Radioanalytical and Nuclear Chemistry

, Volume 322, Issue 2, pp 1031–1037 | Cite as

Determination of kinetic properties of Sm(III)/Sm(II) reaction in LiCl–KCl molten salt using cyclic voltammetry and electrochemical impedance spectroscopy

  • Dalsung YoonEmail author
  • Jinnapat Pormatikul
  • Michael Shaltry
  • Supathorn Phongikaroon
  • Kerry Allahar


Electrochemical and kinetic properties of samarium (Sm) in LiCl–KCl eutectic salt were investigated at various concentrations and temperatures. Cyclic voltammetry (CV) were performed to determine diffusion coefficient and the rate constant (k0). In addition, electrochemical impedance spectroscopy (EIS) was conducted for further understandings on the kinetic behaviors of Sm(III)/Sm(II) couple. The values of the diffusion coefficients were in the range of 3.54 × 10−6 to 9.58 × 10−5 cm2 s−1 and the values of k0 were estimated to be in the range of 0.63 × 10−2 to 1.11 × 10−2 cm s−1. The values of i0 for Sm(III)/Sm(II) were computed by obtaining the charge transfer resistance from the curve fitting analysis, ranging from 1.04 × 10−3 to 2.97 × 10−3 A cm−2.


Samarium chloride Kinetic parameters LiCl–KCl EIS Pyroprocess 



Experiments were prepared and conducted under the support of Idaho National Laboratory–Laboratory Directed Research and Development (INL-LDRD) at the Center for Advanced Energy Studies (CAES). Data analysis was performed at Virginia Commonwealth University using Faculty Career Award funding received from the Nuclear Regulatory Commission.


  1. 1.
    Simpson MF and Law JD (2010) Nuclear fuel reprocessing. INL/EXT-10-17753Google Scholar
  2. 2.
    Ackerman JP (1991) Chemical basis for pyrochemical reprocessing of nuclear fuel. Ind Eng Chem Res 30:141–145CrossRefGoogle Scholar
  3. 3.
    Bae S, Jung T, Cho Y, Kim J, Kwak K, Park T (2018) Electrochemical formation of divalent samarium cation and its characteristics in LiCl–KCl melt. Inorg Chem 57:8299–8306CrossRefGoogle Scholar
  4. 4.
    Cordoba G, Caravaca C (2004) An electrochemical study of samarium ions in the molten eutectic LiCl + KCl. J Electroanal Chem 572:145–151CrossRefGoogle Scholar
  5. 5.
    Andrews H, Phongikaroon S (2018) Developments of an experimental routine for electrochemical and laser-induced breakdown spectroscopy composition measurements of SmCl3 in LiCl–KCl eutectic salt systems. Nucl Technol 208:891–904Google Scholar
  6. 6.
    Bard AJ, Faulkner LR (2011) Electrochemical methods, fundamentals and applications. Wiley, New YorkGoogle Scholar
  7. 7.
    Klingler RJ, Kochi JK (1980) Electron-transfer kinetics from cyclic voltammetry. J Phys Chem 85:1731–1741CrossRefGoogle Scholar
  8. 8.
    Mohamedi M, Bouteillon J, Poignet JC (1996) Electrochemical impedance spectroscopy study of indium couples in LiCl–KCl eutectic at 450°C. Electrochim Acta 41(9):1495–1504CrossRefGoogle Scholar
  9. 9.
    Vandernoot TJ (1991) Limitations in the analysis of ac impedance data with poorly separated faradaic and diffusional processes. J Electroanal Chem 300:199CrossRefGoogle Scholar
  10. 10.
    Lasia A (2014) Electrochemical impedance spectroscopy and its applications. Springer, New YorkCrossRefGoogle Scholar
  11. 11.
    Yoon D, Phongikaroon S (2015) Electrochemical properties and analyses of CeCl3 in LiCl–KCl eutectic salt. J Electrochem Soc 162(10):E237–E243CrossRefGoogle Scholar
  12. 12.
    Marsden KC, Pesic B (2011) Evaluation of the electrochemical behavior of CeCl3 in molten LiCl–KCl eutectic utilizing metallic Ce as an anode. J Electrochem Soc 158(6):F111–F120CrossRefGoogle Scholar
  13. 13.
    Choi I, Serrano BE, Li SX, Herrmann S, Phongikaroon S (2009) Determination of exchange current density of U3+/U couple in LiCl–KCl eutectic mixture. GLOBAL, ParisGoogle Scholar
  14. 14.
    Ghosh S, Vandarkuzhali S, Gogoi N, Venkatesh P, Seenivasan G (2011) Anodic dissolution of U, Zr and U–Zr alloy and convolution voltammetry of Zr4+/Zr2+ couple in molten LiCl–KCl eutectic. Electrochim Acta 56:8204–8218CrossRefGoogle Scholar
  15. 15.
    Rose MA, Williamson MA, Willit J (2015) Determining the exchange current density and tafel constant for uranium in LiCl/KCl eutectic. ECS Electrochem Lett. 4(1):C5–C7CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical and Nuclear EngineeringVirginia Commonwealth UniversityRichmondUSA
  2. 2.Pyropchemistry and Molten Salt System DepartmentIdaho National LaboratoryIdaho FallsUSA
  3. 3.Department of Materials Science and EngineeringBoise State UniversityBoiseUSA
  4. 4.Nucelar Fuel Cycle Process Research DivisionKorea Atomic Energy Research InstituteDaejeonSouth Korea

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