In Situ Electrochemical Study of the Coexistence of Eu 3+ and Eu 2+ in Molten LiCl-KCl by Rotating Disc Electrode

Ge, Jianbang; Park, Jaewoo; Leong, Amanda; Zhang, Jinsuo

doi:10.1149/1945-7111/abd2da

Title: In Situ Electrochemical Study of the Coexistence of Eu ³⁺ and Eu ²⁺ in Molten LiCl-KCl by Rotating Disc Electrode

Journal Article · Tue Dec 01 00:00:00 EST 2020 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/abd2da· OSTI ID:1850549

; Park, Jaewoo; Leong, Amanda; Zhang, Jinsuo

In this study, a graphite rotating disc electrode was successfully designed and applied to conduct electrochemical measurements under flow conditions in molten LiCl-KCl at 773 K. The concentration and diffusion coefficients of Eu³⁺and Eu²⁺in molten salt were quantitatively measured with this electrode by applying in situ cyclic voltammetry and chronoamperometry techniques. The initial concentration ratio of Eu³⁺/Eu²⁺in LiCl-KCl-0.5 wt% EuCl₃was calculated to be 2.37. The calculated diffusion coefficients of Eu³⁺and Eu²⁺in the salt were 9.31 ± 0.06 × 10^-5cm²s^-1and 9.65 ± 0.6 × 10^-5cm²s^-1, respectively. A decrease of the diffusion coefficient of Eu³⁺and Eu²⁺was observed at a higher concentration of EuCl₃, which implies the enhanced Eu-Eu ion interaction. This electrode design is expected to be utilized for the concentration measurement of multivalent ions in a flowing molten salt.

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Research Organization:: Oregon State Univ., Corvallis, OR (United States)

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

DOE Contract Number:: NE0008756

OSTI ID:: 1850549

Journal Information:: Journal of the Electrochemical Society, Vol. 167, Issue 16; ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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