Kinetic Properties of Ni2+ in FLiNaK Molten Salt Determined via Cyclic Voltammetry Measurements

The kinetic properties of Ni2+ in FLiNaK + 1 mol% NiF2 molten salt electrolyte were determined at T = 475–550 °C using voltammetry (CV) to gain an understanding of molten salt reactor (MSR) fuel salt mass transport properties. A three-electrode electrochemical cell consisting of a glassy carbon working electrode (WE), nickel wire reference electrode (RE), and a nickel wire coil counter electrode (CE) was employed to estimate the diffusivity (7.28 x 10^(-7) cm^2 s^(-1) at 500 °C) and activation energy, (102 kJ mol^(-1)) of the Ni2+ in FLiNaK. Kinetic properties determined through this work were compared to available literature which showed comparable Ni2+ diffusivity values. The cyclic voltammetry of the Ni2+/Ni deposition and removal steps at scan rates of 50–300 mV s^(-1) indicated Nernstian behavior for the soluble/insoluble electrochemical system. The diffusivity and activation energy results will serve as a critical resource for future modeling of fluoride molten salt kinetic properties to drive research and development of MSRs.

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Work Title Kinetic Properties of Ni2+ in FLiNaK Molten Salt Determined via Cyclic Voltammetry Measurements
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Creators
  1. Stephen Lombardo
  2. Nathan D. Smith
  3. Shun-Li Shang
  4. Hojong Kim
License No Copyright - U.S.
Work Type Research Paper
Publication Date July 2022
Deposited October 10, 2023

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Version 1
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  • Updated Acknowledgments Show Changes
    Acknowledgments
    • Nathan D. Smith, Shun-Li Shang, Hojong Kim
  • Added Creator Stephen Lombardo
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    Publication Date
    • 2022-07
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    • https://rightsstatements.org/page/NoC-US/1.0/
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  • Updated Description Show Changes
    Description
    • The kinetic properties of Ni2+ in FLiNaK + 1 mol% NiF2 molten salt electrolyte were determined at T = 475–550 °C using voltammetry (CV) to gain an understanding of molten salt reactor (MSR) fuel salt mass transport properties. A three-electrode electrochemical cell consisting of a glassy carbon working electrode (WE), nickel wire reference electrode (RE), and a nickel wire coil counter electrode (CE) was employed to estimate the diffusivity (7.28 x 10-7 cm2 s-1 at 500 °C) and activation energy, (102 kJ mol-1) of the Ni2+ in FLiNaK. Kinetic properties determined through this work were compared to available literature which showed comparable Ni2+ diffusivity values. The cyclic voltammetry of the Ni2+/Ni deposition and removal steps at scan rates of 50–300 mV s–1 indicated Nernstian behavior for the soluble/insoluble electrochemical system. The diffusivity and activation energy results will serve as a critical resource for future modeling of fluoride molten salt kinetic properties to drive research and development of MSRs.
    • The kinetic properties of Ni2+ in FLiNaK + 1 mol% NiF2 molten salt electrolyte were determined at T = 475–550 °C using voltammetry (CV) to gain an understanding of molten salt reactor (MSR) fuel salt mass transport properties. A three-electrode electrochemical cell consisting of a glassy carbon working electrode (WE), nickel wire reference electrode (RE), and a nickel wire coil counter electrode (CE) was employed to estimate the diffusivity (7.28 x 10^(-7) cm^2 s^(-1) at 500 °C) and activation energy, (102 kJ mol^(-1)) of the Ni2+ in FLiNaK. Kinetic properties determined through this work were compared to available literature which showed comparable Ni2+ diffusivity values. The cyclic voltammetry of the Ni2+/Ni deposition and removal steps at scan rates of 50–300 mV s^(-1) indicated Nernstian behavior for the soluble/insoluble electrochemical system. The diffusivity and activation energy results will serve as a critical resource for future modeling of fluoride molten salt kinetic properties to drive research and development of MSRs.
  • Updated Acknowledgments Show Changes
    Acknowledgments
    • Nathan D. Smith, Shun-Li Shang, Hojong Kim
  • Added Creator Nathan D. Smith
  • Added Creator Shun-Li Shang
  • Added Creator Hojong Kim
  • Updated