Electrochemical measurement and analysis of YCl3, ScCl3, GdCl3 and MgCl2 in molten eutectic LiCl-KCl

Shaltry, Michael R.; Tripathy, Prabhat K.; Yoo, Tae-Sic; Fredrickson, Guy L.

doi:10.1016/j.jelechem.2021.115689

Electrochemical measurement and analysis of YCl₃, ScCl₃, GdCl₃ and MgCl₂ in molten eutectic LiCl-KCl

Journal Article · Thu Sep 09 00:00:00 EDT 2021 · Journal of Electroanalytical Chemistry

DOI:https://doi.org/10.1016/j.jelechem.2021.115689· OSTI ID:1898134

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

For this work, electrochemical measurements of YCl₃, ScCl₃, GdCl₃ and MgCl₂ were obtained in molten LiCl-KCl eutectic at 773 K using a three-electrode configuration. Tungsten rods were used as the working and counter electrodes. Two quasi- and one reference electrode(s) (glassy carbon, nickel wire, and Ni/NiO) were used to collect electrochemical measurements of the analyte salts. Cyclic voltammetry data were analyzed to calculate values of diffusion coefficient, exchange current density, and charge transfer resistance and were determined to be on the order of 10^–5 cm² s^–1, 10^–2 A cm^–2, and 10⁰ Ω; respectively. In general, the values of diffusion coefficients were found to be consistent with those reported of high-temperature molten salts. Relatively large values of exchange current density corresponded with smaller values of charge transfer resistance. These values were found to be reasonable in comparison to results available in the literature. The measured cyclic voltammograms were normalized with respect to both lithium reduction and chloride ion oxidation potentials. Such a normalization technique is effective for comparing experimentally obtained cyclic voltammetry data to those that have been published. An analysis of experimentally obtained results indicates the relation of electrode reactions (e.g., differences of reduction potentials) are independent of the choice of reference electrode. Additionally, the choice of reference electrode did not affect the electrochemical window, exchange current density, or diffusion coefficient values.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1898134

Alternate ID(s):: OSTI ID: 1820193
OSTI ID: 2472809

Report Number(s):: INL/JOU--20-57994-Rev000; INL/JOU--21-63006-Rev000

Journal Information:: Journal of Electroanalytical Chemistry, Journal Name: Journal of Electroanalytical Chemistry Vol. 899; ISSN 1572-6657

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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