Determination of Kinetic Properties of Ni(II) Ions in Molten LiF-NaF-KF via Voltammetry

Nathan D. Smith; Stephen Lombardo; Shun Li Shang; Zi Kui Liu; Hojong Kim

doi:10.1149/1945-7111/acd6c1

Determination of Kinetic Properties of Ni(II) Ions in Molten LiF-NaF-KF via Voltammetry

Nathan D. Smith, Stephen Lombardo, Shun Li Shang, Zi Kui Liu, Hojong Kim

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

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Abstract

Kinetic properties of Ni(II) in eutectic LiF-NaF-KF (FLiNaK) molten salt were determined at T = 748-823 K using cyclic voltammetry (CV), square wave voltammetry (SWV), and chronoamperometry (CA) measurements using a glassy C working electrode, Ni(II)/Ni reference electrode, and Ni counter electrode. Reduction of Ni(II) to Ni(s) was determined to be a single step, two-electron transfer process. Diffusivity values were calculated using the Berzins and Delahay equation and semi-integral electroanalysis from the CV measurements as well as using the Cottrell equation from the CA measurements. Diffusivity of Ni(II) in molten FLiNaK at T = 748-823 K was determined to be 3.27 × 10^-7-3.04 × 10^-6cm² s^-1 with an activation energy of 62-104 kJ mol^-1. The estimated kinetic properties varied appreciably among methodologies possibly due to inherent assumptions in theory regarding reversibility and unit activity during Ni metal deposition on the working electrode.

Original language	English (US)
Article number	066505
Journal	Journal of the Electrochemical Society
Volume	170
Issue number	6
DOIs	https://doi.org/10.1149/1945-7111/acd6c1
State	Published - Jun 1 2023

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Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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10.1149/1945-7111/acd6c1

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@article{313a834162014c54900e1d502871ec26,

title = "Determination of Kinetic Properties of Ni(II) Ions in Molten LiF-NaF-KF via Voltammetry",

abstract = "Kinetic properties of Ni(II) in eutectic LiF-NaF-KF (FLiNaK) molten salt were determined at T = 748-823 K using cyclic voltammetry (CV), square wave voltammetry (SWV), and chronoamperometry (CA) measurements using a glassy C working electrode, Ni(II)/Ni reference electrode, and Ni counter electrode. Reduction of Ni(II) to Ni(s) was determined to be a single step, two-electron transfer process. Diffusivity values were calculated using the Berzins and Delahay equation and semi-integral electroanalysis from the CV measurements as well as using the Cottrell equation from the CA measurements. Diffusivity of Ni(II) in molten FLiNaK at T = 748-823 K was determined to be 3.27 × 10-7-3.04 × 10-6 cm2 s-1 with an activation energy of 62-104 kJ mol-1. The estimated kinetic properties varied appreciably among methodologies possibly due to inherent assumptions in theory regarding reversibility and unit activity during Ni metal deposition on the working electrode.",

author = "Smith, {Nathan D.} and Stephen Lombardo and Shang, {Shun Li} and Liu, {Zi Kui} and Hojong Kim",

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doi = "10.1149/1945-7111/acd6c1",

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AU - Smith, Nathan D.

AU - Lombardo, Stephen

AU - Shang, Shun Li

AU - Liu, Zi Kui

AU - Kim, Hojong

PY - 2023/6/1

Y1 - 2023/6/1

N2 - Kinetic properties of Ni(II) in eutectic LiF-NaF-KF (FLiNaK) molten salt were determined at T = 748-823 K using cyclic voltammetry (CV), square wave voltammetry (SWV), and chronoamperometry (CA) measurements using a glassy C working electrode, Ni(II)/Ni reference electrode, and Ni counter electrode. Reduction of Ni(II) to Ni(s) was determined to be a single step, two-electron transfer process. Diffusivity values were calculated using the Berzins and Delahay equation and semi-integral electroanalysis from the CV measurements as well as using the Cottrell equation from the CA measurements. Diffusivity of Ni(II) in molten FLiNaK at T = 748-823 K was determined to be 3.27 × 10-7-3.04 × 10-6 cm2 s-1 with an activation energy of 62-104 kJ mol-1. The estimated kinetic properties varied appreciably among methodologies possibly due to inherent assumptions in theory regarding reversibility and unit activity during Ni metal deposition on the working electrode.

AB - Kinetic properties of Ni(II) in eutectic LiF-NaF-KF (FLiNaK) molten salt were determined at T = 748-823 K using cyclic voltammetry (CV), square wave voltammetry (SWV), and chronoamperometry (CA) measurements using a glassy C working electrode, Ni(II)/Ni reference electrode, and Ni counter electrode. Reduction of Ni(II) to Ni(s) was determined to be a single step, two-electron transfer process. Diffusivity values were calculated using the Berzins and Delahay equation and semi-integral electroanalysis from the CV measurements as well as using the Cottrell equation from the CA measurements. Diffusivity of Ni(II) in molten FLiNaK at T = 748-823 K was determined to be 3.27 × 10-7-3.04 × 10-6 cm2 s-1 with an activation energy of 62-104 kJ mol-1. The estimated kinetic properties varied appreciably among methodologies possibly due to inherent assumptions in theory regarding reversibility and unit activity during Ni metal deposition on the working electrode.

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Determination of Kinetic Properties of Ni(II) Ions in Molten LiF-NaF-KF via Voltammetry

Abstract

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