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| Electrochemical Reduction Mechanism of La3+ on Tungsten Electrode in LiCl-KCl Molten Salt |
| Received:September 18, 2019 Revised:October 05, 2019 |
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| DOI：doi：10.3969/j.issn.1007-7545.2020.03.012 |
| KeyWord:lanthanum; lanthanum chloride; LiCl-KCl eutectic molten salt; electrochemical reduction; diffusion control |
| Author | Institution |
| LI Linshan |
铜陵有色金属集团控股有限公司 |
| ZHAO Yujuan |
铜陵有色金属集团控股有限公司 |
| YANG Shaohua |
江西理工大学 |
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| Abstract: |
| Electrochemical reduction mechanism of La3+ on tungsten electrode at 773 K was studied through cyclic voltammetry, chronopotentiometry and chronoamperometry applying LiCl-KCl and LaCl3 as molten salt and raw material. The results show that electrochemical reduction of La3+ on tungsten electrode is a three-electron transition process by one step in 50%KCl-50%LiCl-2%LaCl3 molten salt at 773 K. Electrode reaction is La3++3e →La and reduction potential of La3+ is -2.05 V(vs. Ag/AgCl) on tungsten electrode. Nuclear polarization phenomenon is observed during depositing process. Depositing process of La is a quasi-reversible reaction. Cyclic voltammetry and chronoamperometry indicate that reduction of La3+ on tungsten electrode process in 50%KCl-50%LiCl-2%LaCl3 molten salt at 773 K is controlled by diffusion step of ions with diffusion coefficient of 6.36×10-5 cm2/s. |
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