Citation: JIANG Tao, TIAN Jie, WANG Ning, PENG Shu-Ming, LI Mei, HANWei, ZHANG Mi-Lin. Electrochemical Behavior of La(III) in Molten LiCl-KCl-LaCl₃[J]. Acta Physico-Chimica Sinica, ;2016, 32(10): 2531-2537. doi: 10.3866/PKU.WHXB201606223 shu

Electrochemical Behavior of La(III) in Molten LiCl-KCl-LaCl₃

JIANG Tao ^1, ,
TIAN Jie ¹ ,
WANG Ning ¹ ,
PENG Shu-Ming ¹ ,
LI Mei ² ,
HANWei ² ,
ZHANG Mi-Lin ²

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, Sichuan Province, P. R. China;
2.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China

Received Date: 18 March 2016
Revised Date: 21 June 2016

Fund Project: The project was supported by the Major Research Plan of the National Natural Science Foundation of China (91426302) and National Natural Science Foundation of China (21301163).

Electrochemical and thermodynamic studies on the formation of La-Ni intermetallic compounds in molten LiCl-KCl-(3.5%(w))LaCl₃ at 773 K were performed. The electrochemical reduction of La(III) ions was investigated on inert W and reactive Ni electrodes by cyclic voltammetry. The reduction potential of La(III)/La on a Ni electrode was observed at more positive potential than that on a W electrode because of the formation of La-Ni intermetallic compounds when La ions reacted with the Ni substrate. Square-wave voltammetry, chronopotentiometry, and open-circuit chronopotentiometry provided further evidence for the formation of La-Ni intermetallic compounds. Potentiostatic electrolysis on a Ni electrode led to the formation of three La-Ni intermetallic compounds, LaNi₅, La₇Ni₁₆ and La₂Ni₃, according to X-ray diffraction (XRD) and scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS) analyses. The standard Gibbs free energies of formation for LaNi₅ were estimated from open-circuit chronopotentiometric measurements using the Gibbs-Helmholtz equation and Hess law. The formation of the La-Ni alloy layer could be controlled by the applied potential and time. Potentiostatic electrolysis was an effective method for electrochemical extraction of La.
- LiCl-KCl-LaCl₃,
- La-Ni,
- Alloy layer,
- Gibbs free energy
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Electrochemical Behavior of La(III) in Molten LiCl-KCl-LaCl3

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Behavior of La(III) in Molten LiCl-KCl-LaCl₃