Fig. 1. Cyclic voltammetry curves of blank FLiBe molten salt (a) and FLiBe-3.35 wt% UF₄ (b) on a W electrode

Fig. 2. SWV curve of FLiBe-3.35 wt% UF₄ molten salt on W electrode for U⁴⁺ ions

Fig. 3. Cyclic voltammetry curves of FLiBe-3.35 wt% UF₄ molten salt at different scanning rates on a W electrode at a temperature of 823 K

Fig. 4. Cyclic voltammetry curves of U⁴⁺ ions in FLiBe-3.35 wt% UF₄ molten salt at different scanning rates on a W electrode at a temperature of 823 K

Fig. 5. Cyclic voltammetry of FLiBe-3 wt% LnF₃ (Ln=Eu, Yb and Sm) molten salt system

Fig. 6. SWV curves for the reduction of Eu(III), Yb(III), and Sm(III) in FLiBe melt on a W electrode at 823 K

Fig. 7. (a) Cyclic voltammograms of the FLiBe-3 wt% EuF₃ molten salt with various scan rates (0.05~0.30 V∙s^-1) at 823 K, insert image: plots of peak current density versus square root of scan rate of Eu³⁺; (b) Plots of peak current density versus square root of scan rate of Yb³⁺ and Sm³⁺ in FLiBe-3 wt% LnF₃ (Ln=Yb and Sm) molten salt

Fig. 8. Cyclic voltammetry curves of FLiBe-3 wt% LnF₃ (LaF₃, CeF₃ and HoF₃) molten salt at 823 K

Fig. 9. (a) Micrograph of deposited products on the tungsten electrode after electrolysis in FLiBe-(10 wt%)UF₄-(1 wt%) LnF₃ (Ln=Eu, Sm, Yb, La, Ce, and Ho) molten salt; (b) The XRD pattern of deposits on tungsten electrode

Fig. 10. (a) SEM image of the deposited products on the tungsten electrode after electrolysis in FLiBe-(10 wt%)UF₄-(1 wt%) LnF₃ (Ln=Eu, Sm, Yb, La, Ce, and Ho) molten salt; (b) The EDS spectrum of deposits on tungsten electrodes (color online)