Electrochemical behavior of Pb(II) in LiCl-KCl-MgCl2-PbCl2 melts on Mo electrode

被引:16
|
作者
Zhang Mi-lin [1 ]
Chen Li-jun [1 ]
Han Wei [1 ]
Yan Yong-de [1 ]
Cao Peng [1 ]
机构
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China
基金
中国国家自然科学基金;
关键词
LiCl-KCl system; cyclic voltammetry; chronopotentiometry; diffusion coefficient; molten salts electrolysis; MG-LI ALLOYS; PB; MAGNESIUM; KCL; CODEPOSITION; KINETICS; CATHODE;
D O I
10.1016/S1003-6326(11)61235-1
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Cyclic voltammetry and chronopotentiometry were used to study the reaction mechanism of Pb(II) and the co-deposition of Pb, Mg and Li on molybdenum electrodes in LiCl-KCl-PbCl2-MgCl2 melts. The diffusion coefficient of lead ions in the melts was determined by different electrochemical techniques. The results obtained by cyclic voltammetry and chronopotentiometry indicated that the underpotential deposition of lithium on pre-deposited Pb leads to the formation of a liquid Li-Pb alloy, and the Mg-Li-Pb alloys are formed after the addition of MgCl2. X-ray diffraction confirmed that in the Mg-Li-Pb alloy, PbLi3, Mg2Pb and Li7Pb2 phases exist by galvanostatic electrolysis at 6.21 A/cm(2) for 2 h at 873 K and the phases can be controlled by changing the concentration of PbCl2 and MgCl2.
引用
收藏
页码:711 / 716
页数:6
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