Transport and kinetics properties of LaF3 in FLiNaK molten salt determined by electrochemical methods

Wang, Yafei; Yang, Qiufeng; Zhang, Jinsuo

doi:10.1016/j.jfluchem.2020.109502

Transport and kinetics properties of LaF₃ in FLiNaK molten salt determined by electrochemical methods

Journal Article · Fri Feb 28 00:00:00 EST 2020 · Journal of Fluorine Chemistry

DOI:https://doi.org/10.1016/j.jfluchem.2020.109502· OSTI ID:1801207

Wang, Yafei ^[1]; Yang, Qiufeng ^[2]; Zhang, Jinsuo ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); OSTI
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

It is found that lanthanum species can exist in the form of LaF₆^3- in FLiNaK (46.5 LiF-11.5 NaF-42 KF, mol%) molten salt in previous studies. The understanding of transport and reaction kinetics parameters of LaF₆^3- ions in FLiNaK molten salt is essential for the electrochemical separation of lanthanum from FLiNaK melt to achieve the coolant clean-up in fluoride salt cooled high-temperature reactor (FHR). Through conducting chronopotentiometry tests, the diffusion coefficients of LaF₆^3- ions in FLiNaK molten salt at the temperature range of 923 K–1023 K were determined. By conducting potentiodynamic polarization measurements at different concentrations and temperatures, the exchange current density, reaction rate constant, and charge transfer coefficient were obtained. The experiment data of potentiodynamic polarization were analyzed using a non-simplified electrode kinetics equation which incorporates both mass transfer and reaction kinetics.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NE0008306

OSTI ID:: 1801207

Alternate ID(s):: OSTI ID: 1603374

Journal Information:: Journal of Fluorine Chemistry, Journal Name: Journal of Fluorine Chemistry Vol. 233; ISSN 0022-1139

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Transport and kinetics properties of LaF3 in FLiNaK molten salt determined by electrochemical methods

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Transport and kinetics properties of LaF₃ in FLiNaK molten salt determined by electrochemical methods