Optical monitoring of the anodic dissolution of zirconium and the agglomeration of potassium hexachlorozirconate during transpassive dissolution in molten LiCl–KCl salt

Lim, Han; Yun, Jong-Il

doi:10.1039/d2re00544a

Cited by 2 publications

(1 citation statement)

References 50 publications

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“…One of the windows was equipped with a commercially available CMOS camera (ILCE-7M2, Sony) that allows for monitoring and recording of the visual state of the electrochemical cell. 17,18 To determine the geometric surface area of the W working electrode, the aspect ratio between the immersion depth (l) and the thickness (2r) was evaluated, as depicted in Fig. 2a.…”

Section: Methodsmentioning

confidence: 99%

Determination of the Diffusion Coefficient in Electrodeposition Reactions by Electrochemical Impedance Spectroscopy: A Case Study of Cobalt in Molten LiCl-KCl Salt

Cha,

Park,

Yun

2024

J. Electrochem. Soc.

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Compared to direct current (DC) techniques, electrochemical impedance spectroscopy (EIS) allows for a more accurate determination of the diffusion coefficient of metal ions in electrodeposition reactions. However, its actual application has been less attempted due to the difficulty in determining complex parameters, such as the concentration of deposited species in the electrode matrix. Here, we introduce a simplified approach to facilitate the EIS application to electrodeposition reactions, using the Co(II)/Co(0) reaction in molten LiCl-KCl salt as a case study. The working electrode surface area was determined by the photography of the electrochemical cell taken in situ. The diffusion coefficients of Co(II) in the LiCl-KCl salt, determined by EIS, were found to be (3.56±0.49)×10-5 cm2/s and (1.61±0.12)×10-5 cm2/s for the tungsten and liquid bismuth electrodes, respectively. The possible reasons for the observed discrepancy in the diffusion coefficients of Co(II) obtained from the two different electrodes are discussed.

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Section: Methodsmentioning

confidence: 99%

Determination of the Diffusion Coefficient in Electrodeposition Reactions by Electrochemical Impedance Spectroscopy: A Case Study of Cobalt in Molten LiCl-KCl Salt

Cha,

Park,

Yun

2024

J. Electrochem. Soc.

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Electrical conductivity of ZrCl4 solutions in the molten LiCl-KCl eutectic

Salyulev,

Potapov

2024

Preprint

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The electrical conductivity of (LiCl-KCl)eut.– ZrCl4 molten mixtures has been studied as a function of the ZrCl4 concentrations (0–30 mol. %) at the temperature ranging from 764 to 1075 K and gradual zirconium tetrachloride concentration growth of ~ 5 mol. %. For these measurements a conductometric cell of an original construction has been used. The electrical conductivity of the formed mixtures was found to range from 0.9 to 2.8 S/cm. The temperature elevation resulted in the increase in electrical conductivity, whereas the increased ZrCl4 concentration resulted in the decrease in the melt electrical conductivity. The newly determined results on the electrical conductivity have been compared with those previously obtained for other zirconium-containing molten systems and discussed considering the available data on the structure of such melts. The liquidus line has been first constructed for the (LiCl-KCl)eut. – ZrCl4 quasi-binary system at the zirconium tetrachloride concentrations reaching 30 mol. %.

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Optical monitoring of the anodic dissolution of zirconium and the agglomeration of potassium hexachlorozirconate during transpassive dissolution in molten LiCl–KCl salt

Abstract: A clear understanding of the anodic dissolution behavior of zirconium in molten LiCl–KCl salt plays an essential role in developing the electrometallurgical recycling of spent nuclear-fuel cladding. In this study,...

Cited by 2 publications

References 50 publications

Determination of the Diffusion Coefficient in Electrodeposition Reactions by Electrochemical Impedance Spectroscopy: A Case Study of Cobalt in Molten LiCl-KCl Salt

Determination of the Diffusion Coefficient in Electrodeposition Reactions by Electrochemical Impedance Spectroscopy: A Case Study of Cobalt in Molten LiCl-KCl Salt

Electrical conductivity of ZrCl4 solutions in the molten LiCl-KCl eutectic

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