Comparison of exchange current density acquisition methods for LaCl3 in molten LiCl-KCl eutectic salt

Hunter Andrews; Supathorn Phongikaroon

doi:10.1149/2.0041810jes

Comparison of exchange current density acquisition methods for LaCl₃ in molten LiCl-KCl eutectic salt

Hunter Andrews, Supathorn Phongikaroon

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The exchange current density values (i0) of the La/La³⁺ in LiCl-KCl eutectic salts at different temperatures (723–798 K) and concentrations (0.229–0.597 mol%) were measured by using cyclic voltammetry (CV), linear polarization (LP), and Tafel methods. The Tafel i₀ values had the largest relative error on an average of 27%, while the LP values, found at the same scan rates, had a lower relative error, ranging from 10–17%. The LP and Tafel results were found to be highly affected by an unstable surface area. The CV i₀ values were less affected by this issue due to higher scan rates, mainly 50–200 mV s⁻¹. The relative error of CV was the least among the three, averaging 6.5–11%. Linear correlations for i₀ versus temperature and concentration were developed from these results.

Original language	English
Pages (from-to)	E412-E419
Journal	Journal of the Electrochemical Society
Volume	165
Issue number	9
DOIs	https://doi.org/10.1149/2.0041810jes
State	Published - 2018
Externally published	Yes

Funding

This study is being performed using funding received from the DOE Office of Nuclear energy’s Nuclear Energy University Programs (NEUP) in collaboration with The University of Utah and The Ohio State University (NEUP-14-6542). This material is based

Funders	Funder number
Office of Environmental and Nuclear Programs
Ohio State University	NEUP-14-6542
University of Utah

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title = "Comparison of exchange current density acquisition methods for LaCl3 in molten LiCl-KCl eutectic salt",

abstract = "The exchange current density values (i0) of the La/La3+ in LiCl-KCl eutectic salts at different temperatures (723–798 K) and concentrations (0.229–0.597 mol%) were measured by using cyclic voltammetry (CV), linear polarization (LP), and Tafel methods. The Tafel i0 values had the largest relative error on an average of 27%, while the LP values, found at the same scan rates, had a lower relative error, ranging from 10–17%. The LP and Tafel results were found to be highly affected by an unstable surface area. The CV i0 values were less affected by this issue due to higher scan rates, mainly 50–200 mV s−1. The relative error of CV was the least among the three, averaging 6.5–11%. Linear correlations for i0 versus temperature and concentration were developed from these results.",

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AB - The exchange current density values (i0) of the La/La3+ in LiCl-KCl eutectic salts at different temperatures (723–798 K) and concentrations (0.229–0.597 mol%) were measured by using cyclic voltammetry (CV), linear polarization (LP), and Tafel methods. The Tafel i0 values had the largest relative error on an average of 27%, while the LP values, found at the same scan rates, had a lower relative error, ranging from 10–17%. The LP and Tafel results were found to be highly affected by an unstable surface area. The CV i0 values were less affected by this issue due to higher scan rates, mainly 50–200 mV s−1. The relative error of CV was the least among the three, averaging 6.5–11%. Linear correlations for i0 versus temperature and concentration were developed from these results.

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Comparison of exchange current density acquisition methods for LaCl₃ in molten LiCl-KCl eutectic salt

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