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

Journal Article · 26 September 2019 · Journal of Radioanalytical and Nuclear Chemistry

DOI: https://doi.org/10.1007/s10967-019-06796-z · OSTI ID:1575283

Yoon, Dalsung  ^[1]; Pormatikul, Jinnapat ^[2]; Shaltry, Michael ^[3]; Phongikaroon, Supathorn ^[2]; Allahar, Kerry ^[4]

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1. Virginia Commonwealth Univ., Richmond, VA (United States); Korea Atomic Energy Research Inst., Daejeon (South Korea)
2. Virginia Commonwealth Univ., Richmond, VA (United States)
3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
4. Boise State Univ., ID (United States)

Electrochemical and kinetic properties of samarium (Sm) in LiCl-KCl eutectic salt were explored 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 additional 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.

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC07-05ID14517
• OSTI ID: 1575283
• Report Number(s): INL/JOU-17-41558-Rev000; TRN: US2001340
• Journal Information: Journal of Radioanalytical and Nuclear Chemistry, Vol. 322, Issue 2; ISSN 0236-5731
• Publisher: SpringerCopyright Statement
• Country of Publication: United States
• Language: English