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| Cathodic Process of Mg2+ on Mo Electrode in NaCl-KCl-CaCl2 Melt |
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Received:August 27, 2018
Revised:August 30, 2018
Accepted:September 03, 2018
Published Online:November 19, 2018
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| DOI：doi：10.3969/j.issn.1007-7545.2018.12.007 |
| KeyWord:molten salt; magnesium; cathode process; diffusion coefficient; nucleation mechanism |
| Author | Institution |
| Liu Zhaoting |
盐湖资源综合利用国家工程研究中心 |
| Lu Guimin |
盐湖资源综合利用国家工程研究中心 |
| Yu Jianguo |
盐湖资源综合利用国家工程研究中心 |
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| Abstract: |
| Electrochemical behavior of MgCl2 in NaCl-KCl-CaCl2 molten chloride mixture was investigated at 973 K with inert molybdenum electrode. Electrochemical methods such as square wave voltammetry (SWV), cyclic voltammetry (CV), chronoamperometry (CA) and chronopotentiometry (CP) were used to study reaction of Mg2+ on molybdenum electrodes. The results show that Mg2+ undergoes one-step reduction reaction (Mg2++2e=Mg) on molybdenum electrode, which is a reversible reaction controlled by diffusion. Nucleation mechanism of magnesium deposition on molybdenum substrate is instantaneous nucleation, which is consistent with formation and growth mechanism of hemispherical nucleus. The Mg2+ diffusion coefficients calculated by different methods of CV, CP and CA in 973 K are 1.09×10-5, 1.24×10-5 and 3.23×10-5 cm2/s, respectively. The product deposited by cathode at a given potential is Mg metal. |
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