Linear Sweep Voltammetry of Nickel in Molten LiF-NaF-KF Eutectic

Abstract

The linear sweep voltammetric study of Ni in molten LiF-NaF-KF eutectic was carried out at temperatures between 470 and 540°C by using an indicator electrode made of Pt bead. The observed reduction wave for Ni(II) was considered due to the reversible two-electron reduction, Ni(II)→ Ni(0). Nickel (II) can be determined in molten LiF-NaF-KF eutectic with the detection limit of 4 × 10^-4 mol/dm³. The diffusion coefficient of Ni(II) was found to be 5 × 10^-6 cm² Is at 500°C and its activation energy, (5.86 ± 1.67) × 10^-4 J/mol.