高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (02): 327-330.doi: 10.3969/j.issn.0251-0790.2012.02.020

• 物理化学 • 上一篇    下一篇

Mn(Ⅱ)在LiCl-KCl-MgCl2-MnCl2熔盐体系中的电化学行为

陈丽军, 张密林, 韩伟, 颜永得, 曹鹏   

  1. 哈尔滨工程大学材料科学与化学工程学院, 教育部超轻材料与表面技术重点实验室, 哈尔滨 150001
  • 收稿日期:2011-06-22 出版日期:2012-02-10 发布日期:2012-01-13
  • 通讯作者: 张密林, 男, 博士, 教授, 博士生导师, 主要从事超轻材料与表面技术方面的研究. E-mail: zhangmilin2009@163.com E-mail:zhangmilin2009@163.com
  • 基金资助:

    国家自然科学基金(批准号: 21101040, 21173060, 21103033)资助.

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

CHEN Li-Jun, ZHANG Mi-Lin, HAN Wei, YAN Yong-De, CAO Peng   

  1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2011-06-22 Online:2012-02-10 Published:2012-01-13

摘要: 采用循环伏安和计时电位等电化学技术研究了Mn(Ⅱ)在LiCl-KCl-MgCl2-MnCl2熔盐体系中的电还原过程和Mg-Li-Mn合金的共沉积条件. 结果显示, 在LiCl-KCl-MgCl2-MnCl2熔盐体系中, Mn(Ⅱ), Mg(Ⅱ)和Li(Ⅰ)的还原电位分别为-1.14, -1.78和-2.19 V. Mn先析出, 在钼电极表面沉积; Mg在Mn上欠电位沉积生成Mg-Mn合金; 而Li在Mg-Mn合金上欠电位沉积形成Mg-Li-Mn合金. 实验结果表明, Mn(Ⅱ)在熔盐中的还原电极过程受扩散控制. Mn(Ⅱ)在熔盐中的扩散系数约为10-5 cm2/s. 运用XRD技术对恒电流电解制备的Mg-Li-Mn合金进行了分析, 结果表明, Mg-Li-Mn合金中含有β-Li, α-Mg和Mn 3个相.

关键词: LiCl-KCl-MgCl2-MnCl2熔盐体系, 循环伏安, 计时电位, 扩散系数, Mg-Li-Mn合金

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

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