In this work, the diffusion coefficient and electrocrystallization of yttrium in LiCl-KCl eutectic are typically investigated using different electrochemical techniques such as cyclic voltammetry (CV), chronopotentiometry (CP) and chronoamperometry (CA) techniques. At temperature from 673 to 823 K, the diffusion coefficients of two yttrium concentrations (YCl3 = 3.816 × 10−5 and 9.981 × 10−5 mol ml−1) were determined by CP and CV methods in a range from 0.453 \times 10−5 to 8.25 \times 10−5 cm2 s−1. The nucleation of Y electrodeposition is confirmed to be an instantaneous mode regardless the given temperature, over-potential and concentrations. The morphology of yttrium nuclei and growth evolution on a tungsten surface were characterized by the SEM-EDS. Some individual circular regions corresponding to initial Y nucleation sites are firstly observed on the tungsten surface. The subsequent formed Y nuclei were found to migrate toward those circular nucleation sites to extend its growth on the inside and peripheral of the circle. In addition, no distinct dendritic structure for the Y deposition was observed on the W surface.
Ruijing Kong,Shanshan Liu,Zepeng Lv,Shaolong Li,Yong Fan,Jilin He,Handong Jiao,Jianxun Song
In electrochemical process, electrolyte composition is one of the key factors that determine the electrochemical behavior of elements. In this work, the nucleation mechanism and deposition process of titanium ions after the introduction of fluoride ions into molten salt were analyzed in detail by electrochemical technology, and the coordination behavior between fluorine ions and titanium was explored by molecular dynamics simulation, revealing the relationship between the electrocrystallization mechanism of titanium and its coordination properties. It can be found that the electrocrystallization mechanism of titanium ions is related to its coordination structure. Under our experimental conditions, the Ti-Cl bond in the system was gradually replaced by the Ti-F bond. This will lead to the change of charge transfer and ion diffusion of titanium ions, which will have an important effect on the electrocrystallization processes. This work has an important guiding significance for further study on the influence of different molten salt systems on the electrocrystallization mechanism of molten salt electrolytic titanium.
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