About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Electrochemical Determination of Thermodynamic and Kinetic Properties of Ni<sup>2+</sup> in FLiNaK Molten Salt |
Author(s) |
Nathan Smith, Stephen Lombardo, Hojong Kim, Shunli Shang, Zi-Kui Liu |
On-Site Speaker (Planned) |
Nathan Smith |
Abstract Scope |
Electrochemical techniques including electromotive force measurements (EMF), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were utilized to determine thermodynamic and kinetic properties of Ni<sup>2+</sup> in FLiNaK at T = 500–700 °C. A concentration cell with a Ni wire in a fixed composition of NiF<sub>2</sub> in FLiNaK as a reference electrode and Ni wires in varying compositions of NiF<sub>2</sub> in FLiNaK as working electrodes was used for EMF measurements, which provided activity values of Ni<sup>2+</sup> in FLiNaK as well as valuable information about the solubility of Ni<sup>2+</sup> and phase behavior. Cyclic voltammetry was also performed using a three-electrode cell to determine the diffusivity of Ni<sup>2+</sup> in FLiNaK as a function of temperature as well as corresponding activation energies. Complementary characterization including X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and differential scanning calorimetry (DSC) were employed to confirm and supplement electrochemical results. |
Proceedings Inclusion? |
Planned: |
Keywords |
Copper / Nickel / Cobalt, Nuclear Materials, High-Temperature Materials |