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<p>This work investigates the impact of F<sup>−</sup> on the electrochemical behavior of Mg(II) and the surface morphology of electrodeposited metallic Mg in the LiCl–KCl system. Using CV and SWV, it was confirmed that the reduction of Mg(II) consistently involves a two-electron transfer process, both before and after the addition of F<sup>−</sup> ions. As the [F<sup>−</sup>]/[Mg(II)] ratio increases, both the redox potential of Mg(II) and the equilibrium potential of the Mg(II)/Mg shift negatively. The complexation coefficient was determined using OCP, and it was found that within the [F<sup>−</sup>]/[Mg(II)] ratio range of 2 to 8, the maximum coordination number between F<sup>−</sup> and Mg(II) is 1. The steady-state current density decreases significantly after the addition of F<sup>−</sup> but shows little change with further increases in the [F<sup>−</sup>]/[Mg(II)] ratio. Additionally, the diffusion coefficient, diffusion layer thickness of Mg(II), charge transfer resistance (<i>R</i><sub>ct</sub>), and exchange current density (<i>j</i><sub>0</sub>) of Mg(II)/Mg were measured using CV, CA, and LP techniques. These parameters all decrease as the [F<sup>−</sup>]/[Mg(II)] ratio increases. Galvanostatic electrolysis was carried out at different [F<sup>−</sup>]/[Mg(II)] ratios, and the products obtained under various conditions were characterized by SEM–EDS and XRD. It was observed that with increasing [F<sup>−</sup>]/[Mg(II)] ratios, the agglomerates in the electrolytic products become larger, and the current efficiency gradually decreases.</p>

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Electrochemical behavior and formation of Mg regulated by additive F− in a molten LiCl–KCl system

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Hedi Wei,
  • Mei Li,
  • Tiexin Yang,
  • Rugeng Liu,
  • Wei Han

摘要

This work investigates the impact of F− on the electrochemical behavior of Mg(II) and the surface morphology of electrodeposited metallic Mg in the LiCl–KCl system. Using CV and SWV, it was confirmed that the reduction of Mg(II) consistently involves a two-electron transfer process, both before and after the addition of F− ions. As the [F−]/[Mg(II)] ratio increases, both the redox potential of Mg(II) and the equilibrium potential of the Mg(II)/Mg shift negatively. The complexation coefficient was determined using OCP, and it was found that within the [F−]/[Mg(II)] ratio range of 2 to 8, the maximum coordination number between F− and Mg(II) is 1. The steady-state current density decreases significantly after the addition of F− but shows little change with further increases in the [F−]/[Mg(II)] ratio. Additionally, the diffusion coefficient, diffusion layer thickness of Mg(II), charge transfer resistance (Rct), and exchange current density (j0) of Mg(II)/Mg were measured using CV, CA, and LP techniques. These parameters all decrease as the [F−]/[Mg(II)] ratio increases. Galvanostatic electrolysis was carried out at different [F−]/[Mg(II)] ratios, and the products obtained under various conditions were characterized by SEM–EDS and XRD. It was observed that with increasing [F−]/[Mg(II)] ratios, the agglomerates in the electrolytic products become larger, and the current efficiency gradually decreases.