Citation: JIANG Tao, PENG Shu-Ming, LI Mei, PEI Ting-Ting, HAN Wei, SUN Yang, ZHANG Mi-Lin. Electrochemical Behavior of Pr(Ⅲ) Ions on a Bi-Coated W Electrode in LiCl-KCl Melts[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1708-1714. doi: 10.3866/PKU.WHXB201604143 shu

Electrochemical Behavior of Pr(Ⅲ) Ions on a Bi-Coated W Electrode in LiCl-KCl Melts

JIANG Tao ^1, ,
PENG Shu-Ming ¹ ,
LI Mei ² ,
PEI Ting-Ting ² ,
HAN Wei ² ,
SUN Yang ² ,
ZHANG Mi-Lin ²

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China;
2.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China

Received Date: 26 February 2016
Revised Date: 13 April 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21271054, 11575047, 21173060), Major Research Plan of the National Natural Science Foundation of China (91326113, 91226201), and Fundamental Research Funds for the Central Universities, China (HEUCF201403001).

The electrochemical behavior of Pr(Ⅲ) ions was studied on a Bi-coatedWelectrode in LiCl-KCl melts by a series of techniques, such as cyclic voltammetry, square wave voltammetry, and open circuit chronopotentiometry. From the cyclic voltammogram and square wave voltammogram, the underpotential deposition of Pr(Ⅲ) on pre-deposited Bi (i.e., a Bi-coated W electrode) occurs, owing to the formation of Pr-Bi intermetallic compounds, resulting in the electrochemical reduction of Pr(Ⅲ) at less cathodic potentials than that on an inert W electrode. Using the open circuit chronopotentiometry technique, two plateaus, corresponding to the co-existence of two phases of Pr-Bi intermetallic compound, were observed. Thermodynamic properties, such as the activities and relative partial molar Gibbs energies of Pr in the Pr-Bi alloys as well as Gibbs energies of the formation for the Pr-Bi intermetallic compounds, were estimated from the open circuit potential measurement in the temperature range of 723-873 K. Pr-Bi alloys were produced on the liquid Bi pool electrode by potentiostatic electrolysis, and were characterized by X-ray diffraction (XRD) and scanning electronic microscopy with energy-dispersive spectrometry (SEM-EDS). The results indicated that the intermetallic LiClcompounds, PrBi₂ and PrBi, were obtained.
- Electrochemical behavior,
- Pr-Bi intermetallic compound,
- Underpotential deposition,
- Thermodynamic property,
- Potentiostatic electrolysis
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