Effect of Metal Chloride Impurities on Equilibrium Potential of Fe/FeCl 2 in Eutectic LiCl-KCl

Newton, Matthew; Merwin, Augustus; McMurray, Jake; Simpson, Michael

doi:10.1149/1945-7111/ace6ff

Effect of Metal Chloride Impurities on Equilibrium Potential of Fe/FeCl ₂ in Eutectic LiCl-KCl

Journal Article · Sat Jul 01 04:00:00 EDT 2023 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ace6ff· OSTI ID:2424438

; Merwin, Augustus; McMurray, Jake;

In this study, interaction of dilute metal chloride solutes in molten eutectic LiCl-KCl was studied via equilibrium potential measurements. Open circuit potential (OCP) was measured between a pure iron rod and a Ag/AgCl reference electrode with concentration of FeCl₂varying from 0.2–1 mol% at 530 °C. The Nernst equation was used to calculate activity coefficient of FeCl₂based on OCP. Measurements were made in LiCl-KCl-FeCl₂with and without additions of 0.5 mol% CsCl, NaCl, and LaCl₃. The activity coefficient of FeCl₂was found to be unaffected by these small concentrations of CsCl, LaCl₃, and NaCl. However, there was observed evidence that the activity coefficient of FeCl₂, above 0.8 mol% Fe, may be affected by the presence of LaCl₃at higher concentrations beginning around 0.5 mol% La. Over the full range of conditions tested, the activity coefficient of FeCl₂in molten LiCl-KCl ranged from 2.95 × 10⁻⁵to 1.01 × 10⁻⁴.

Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 2424438

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 170; ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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