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

Shaltry, Michael R.; Allahar, Kerry N.; Butt, Darryl P.; Simpson, Michael F.; Phongikaroon, Supathorn

doi:10.7733/jnfcwt.2020.18.1.1

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

Abstract

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.

Authors:

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Idaho National Lab. (INL), Idaho Falls, ID (United States)
Boise State Univ., ID (United States)
Univ. of Utah, Salt Lake City, UT (United States)
Virginia Commonwealth Univ., Richmond, VA (United States)

Publication Date:: 2020-03-10

Research Org.:: Idaho National Lab. (INL), Idaho Falls, ID (United States)

Sponsoring Org.:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1631811

Report Number(s):: INL/JOU-15-34095-Rev000
Journal ID: ISSN 1738-1894; TRN: US2201259

Grant/Contract Number:: AC07-05ID14517

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Fuel Cycle and Waste Technology

Additional Journal Information:: Journal Volume: 18; Journal Issue: 1; Journal ID: ISSN 1738-1894

Publisher:: Korean Radioactive Waste Society

Country of Publication:: United States

Language:: English

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

Citation Formats


                    Shaltry, Michael R., Allahar, Kerry N., Butt, Darryl P., Simpson, Michael F., and Phongikaroon, Supathorn. Electrochemical Impedance Spectroscopy and Cyclic Voltammetry Methods for Monitoring SmCl3 Concentration in Molten Eutectic LiCl-KCl.  United States: N. p., 2020. 
Web.  doi:10.7733/jnfcwt.2020.18.1.1.

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                    Shaltry, Michael R., Allahar, Kerry N., Butt, Darryl P., Simpson, Michael F., & Phongikaroon, Supathorn. Electrochemical Impedance Spectroscopy and Cyclic Voltammetry Methods for Monitoring SmCl3 Concentration in Molten Eutectic LiCl-KCl.  United States.  https://doi.org/10.7733/jnfcwt.2020.18.1.1

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                    Shaltry, Michael R., Allahar, Kerry N., Butt, Darryl P., Simpson, Michael F., and Phongikaroon, Supathorn. Tue .  
"Electrochemical Impedance Spectroscopy and Cyclic Voltammetry Methods for Monitoring SmCl3 Concentration in Molten Eutectic LiCl-KCl".  United States.  https://doi.org/10.7733/jnfcwt.2020.18.1.1.  https://www.osti.gov/servlets/purl/1631811.

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@article{osti_1631811,

  title        = {Electrochemical Impedance Spectroscopy and Cyclic Voltammetry Methods for Monitoring SmCl3 Concentration in Molten Eutectic LiCl-KCl},

  author       = {Shaltry, Michael R. and Allahar, Kerry N. and Butt, Darryl P. and Simpson, Michael F. and Phongikaroon, Supathorn},

  abstractNote = {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.},

  doi          = {10.7733/jnfcwt.2020.18.1.1},

  journal      = {Journal of Nuclear Fuel Cycle and Waste Technology},

  number       = 1,

  volume       = 18,

  place        = {United States},

  year         = {2020},

  month        = {3}

}

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Figure 1: Schematic of the experimental setup of the three-probe electrode in the molten salt contained in the graphite crucible and placed within the sleeve of the furnace.

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

Abstract

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