Electrode reaction of Pr(III) and coreduction of Pr(III) and Pb(II) on W electrode in eutectic LiCl-KCl

Li, Mei; Sun, Zhongxuan; Guo, Dan; Han, Wei; Yangshan, Sun; Yang, Xuguang; Zhang, Milin

doi:10.1007/s11581-020-03518-4

Cited by 14 publications

(11 citation statements)

References 39 publications

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“…The controlling steps of the electrochemical reaction of metal ions in an electrolyte solution can be determined assuming that a wonderful proportion relationship is found after fitting. In that case, the diffusion coefficient of In 3+ in the system can be calculated according to the Berzins–Delahay equation ( Kang et al, 2020 ; Li et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Mechanism of the Preparation of High-Purity Indium by Electrodeposition

Hou

Wang

et al. 2022

Front. Chem.

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Indium is a crucial material and is widely used in high-tech industries, and electrodeposition is an efficient method to recover rare metal resources. In this work, the electrochemical behavior of In3+ was investigated by using different electrochemical methods in electrolytes containing sodium and indium sulfate. Cyclic voltammetry (CV), chronoamperometry (CA), and alternating current impedance (EIS) techniques were used to investigate the reduction reaction of In3+ and the electrocrystallization mechanism of indium in the indium sulfate system. The cyclic voltammetry results showed that the electrodeposition process is irreversible. The average charge transfer coefficient a of In3+ was calculated to be 0.116 from the relationship between the cathodic peak potential and the half-peak potential, and the H+ discharge occurred at a higher negative potential of In3+. The nucleation mechanism of indium electrodeposition was analyzed by chronoamperometry. The mechanism of indium at potential steps of −0.3 to −0.6 V was close to diffusion-controlled instantaneous nucleation with a diffusion coefficient of 7.31 × 10−9 cm2 s−1. The EIS results demonstrated that the reduction process of In3+ is subject to a diffusion-controlled step when pH = 2.5 and the applied potential was −0.5 V. SEM and XRD techniques indicated that the cathodic products deposited on the titanium electrode have excellent cleanliness and purity.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Mechanism of the Preparation of High-Purity Indium by Electrodeposition

Hou

Wang

et al. 2022

Front. Chem.

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“…At present, dry reprocessing technology includes molten salt electrore ning [4][5][6], oxide electrodeposition [7][8][9], reduction extraction using molten salt and liquid metal [10,11], as well as uoride volatilization [12]. Among them, molten salt electrore ning, involving in anodic dissolution [13][14][15] and cathodic electrodeposition processes [16][17][18][19][20], has the advantages of short process ow, small amount of radioactive waste, and low critical risk, and is considered to be the most promising dry reprocessing technology for spent fuel. In order to improve uranium utilization and reduce the volume of nuclear waste, the electrochemical extraction of uranium and rare earth elements (REs) from LiCl-KCl molten salt was studied [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical formation of Pr aided by additive (KF) in LiCl-KCl molten salt

Li,

Du,

Wei

et al. 2024

Preprint

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In order to investigate the influences of the additive (KF) on electrochemistry and deposit morphology of Pr, various electrochemical techniques were used to comparative investigate the electroreduction potential and diffusion coefficient of Pr3+ and kinetic properties of Pr3+/Pr in LiCl-KCl-PrCl3 before and after the addition of KF at different molar concentration ratio of F− to Pr3+ (k). Cyclic voltammetry, square wave voltammetry and reverse chronopotentiometry results showed that the value of k (k = 0, 1, 2, 3 and 4) had no effect on reduction mechanism of Pr3+. With the increase of k, the reduction peak potential moved in the negative direction, the diffusion coefficient decreased, and diffusion activate energy increased. Meanwhile, the exchanged current densities (j0), charge transfer resistances (Rct), and activate energies (Ea) were measured at different k by linear polarization technique, which illustrated that with the augment of k, j0 gradually reduced, and Ea and Rct increased. Furthermore, the electrochemical preparation of Pr aided by KF was explored by potentiostatic electrolysis at different k, and the products were characterized by XRD, SEM and EDS, which indicated that with the increase of k, the morphology of metallic Pr changed from slender needles to granular.

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“…Then, referencing current and potential parameter results, the appropriate potential and current are selected for electrolysis to extract the lanthanides. Therefore, the electrochemical behavior of lanthanides on different cathodes has been studied extensively, including Al, − Ni, − Zn, − Mg, − Sn, , Cu, − Bi, − and Pb. ,, The study of electrochemical processes on different electrodes provides basic experimental data for the extraction and separation of lanthanides. In this study, a Sn membrane and liquid tin were used as cathodes to extract neutron poisoning neodymium from molten salt.…”

Section: Introductionmentioning

confidence: 99%

Efficient Recovery of the Fission Element Neodymium by Electrodeposition from Molten LiCl–KCl and Research on the Thermodynamics and Dynamics of Processes

Wang

Liu

Quan

et al. 2022

ACS Sustainable Chem. Eng.

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The efficient extraction of neodymium, a neutron poison, is of great significance in the dry reprocessing process for the nuclear fuel cycle. The electrochemical extraction of neodymium on a tin electrode has been studied in molten salts by various electrochemical methods, and its kinetic and thermodynamic parameters have been provided. The calculated values of the diffusion coefficient and diffusion activity energy for Sn(II) and Nd(III) on the W electrode are 1.34 × 10–5 to 3.54 × 10–5 cm2 S–1/36.17 kJ mol–1 and 2.18 × 10–5 to 3.06 × 10–5 cm2 S–1/31.19 kJ mol–1, respectively. The deposition mechanism and precipitation potential sequence of Sn(II) and Nd(III) for the W electrode were studied in detail by cyclic voltammetry and open circuit chronopotential, and the formation enthalpy and entropy of Sn3Gd intermetallic compound are −271.9 kJ mol–1 and −55.9 J mol–1 K–1. According to the analysis of the electrochemical potential parameters, the appropriate potential and current were selected for the electrolysis experiments. Therefore, the fission product neodymium is deposited on the liquid tin cathode via potentiostatic/galvanostatic technologies. X-ray diffraction analysis and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy were used to characterize the cathode alloy samples. The average recovery rate of neodymium on the liquid tin cathode is about 99.08% by multiple analysis of inductively coupled plasma atomic emission spectrometry.

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Electrode reaction of Pr(III) and coreduction of Pr(III) and Pb(II) on W electrode in eutectic LiCl-KCl

Cited by 14 publications

References 39 publications

Electrochemical Mechanism of the Preparation of High-Purity Indium by Electrodeposition

Electrochemical Mechanism of the Preparation of High-Purity Indium by Electrodeposition

Electrochemical formation of Pr aided by additive (KF) in LiCl-KCl molten salt

Efficient Recovery of the Fission Element Neodymium by Electrodeposition from Molten LiCl–KCl and Research on the Thermodynamics and Dynamics of Processes

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