Electrochemical Behavior of Mn(Ⅱ) in the Melt LiCl-KCl-MgCl2-MnCl2

doi:10.3969/j.issn.0251-0790.2012.02.020

Abstract

Abstract: The reduction of Mn(Ⅱ) on a molybdenum electrode in the melt LiCl-KCl-MgCl₂-MnCl₂ at 898 K and the conditions of the co-deposition of Mg-Li-Mn alloys were investigated. Cyclic voltammetry and chronopotentiometry show that the reductions of Mn(Ⅱ), Mg(Ⅱ) and Li(Ⅰ) start at -1.14, -1.78 and -2.19 V, respectively. And the underpotential deposition of magnesium on pre-deposited manganese leads to the formation of a liquid Mg-Mn solution, then a liquid Mg-Li-Mn solution forms for the succeeding underpotential deposition of lithium on pre-deposited Mg-Mn. The diffusion coefficient of Mn(Ⅱ) in the melts was also calculated with different methods, which was about 10^-5 cm²/s. The analysis of X-ray diffraction indicats that there are three phases(β-Li, α-Mg and Mn) in the Mg-Li-Mn alloy.

Key words: Melt LiCl-KCl-MgCl₂-MnCl₂, Cyclic voltammogram, Chronopotentiometric, Diffusion coefficient, Mg-Li-Mn alloy

CLC Number:

O646

TrendMD:

CHEN Li-Jun, ZHANG Mi-Lin, HAN Wei, YAN Yong-De, CAO Peng. Electrochemical Behavior of Mn(Ⅱ) in the Melt LiCl-KCl-MgCl₂-MnCl₂[J]. Chem. J. Chinese Universities, 2012, 33(02): 327.

References

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Electrochemical Behavior of Mn(Ⅱ) in the Melt LiCl-KCl-MgCl₂-MnCl₂

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