Effect of fluoride ions on coordination structure of titanium in molten NaCl-KCl

Liu, Shanshan; Li, Shaolong; Liu, Chenhui; He, Jilin; Song, Jianxun

doi:10.1007/s12613-022-2527-z

Cited by 5 publications

(5 citation statements)

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“…Effect of F − on titanium deposition.-According to the above analysis and our previous mathematical calculation results, 27 the addition of fluoride ions in molten salt electrolyte has a great influence on the electrochemistry steps and formation of titanium ions. Its deep logic is the change of titanium ions complex structure and then affects the charge transfer and the diffusion of titanium ions, which will influence the electrocrystallization process.…”

Section: Resultsmentioning

confidence: 84%

“…Where I m is the peak current (mA) and t m is the time corresponding to the peak current (s). In our previous study, 27 to investigate the effect of fluoride ions on the electrochemical behavior of titanium ions, cyclic voltammetry tests were performed by adding a certain amount of TiCl x to the NaCl-KCl molten salt and introducing different concentrations of KF. The test results show that for α = 0.0, 1.0, and 2.0, it is a two-step reduction process of R 1 : Ti(III) → Ti(II) and R 2 : Ti(II) → Ti with reduction peaks R 1 and R 2 potentials −1.69 V/−1.99 V, −1.81 V/−2.12, and −1.19 V/−2.15 V, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Regarding the calculation of the average valence state, we first made a preliminary determination of the ions present in the molten salt and their concentrations based on the XPS test plots of the ionic coordination structures in the molten salt with different fluoride ion concentrations from published work. 27 Then, we quantified the titanium ion concentration at different fluoride ion concentrations using chemical analysis. The results were shown in Table II.…”

Section: Resultsmentioning

confidence: 99%

“…The specific preparation methods are described in detail in the previously published literature. 27 In this experiment, the concentration of titanium ions in the salt prepared by us is 15.41 wt%, where W Ti 3+ = 8.30 wt%, W Ti 2+ = 3.18 wt%, and W Ti 4+ = 3.93 wt%. Titanium ions in NaCl-KCl melt were diluted at a concentration of 1.0 wt%.…”

Section: Methodsmentioning

confidence: 98%

“…14 In our recent work, we have discussed the possible stabilized state of titanium ions through mathematic calculation combined with electrochemical analysis and spectral analysis. 27 It was found that fluoride ions could shorten the reduction step of titanium ions and greatly affect the valence ratio of titanium ions.…”

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The Coordination of Titanium Ions and the Electrocrystallization Mechanism in Molten Chloride-Fluoride Salts

Kong,

Liu,

et al. 2023

J. Electrochem. Soc.

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In the 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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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

mentioning

confidence: 99%

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