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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (19): 2248-2252. 上一篇    下一篇

研究论文

Mg-8Li, Mg-8Li-0.5Ce和Mg-8Li-1Ce合金在0.7 mol•L－1 NaCl溶液中电化学性能的研究

吕艳卓*,1，徐岩2，王学新1，张毅1，陆天虹3   

  1. (1哈尔滨工程大学材料科学与化学工程学院 哈尔滨 150001)
    (2哈尔滨工程大学工程训练中心 哈尔滨 150001)
    (3南京师范大学化学与环境科学学院 南京210097)
  • 投稿日期:2010-12-06 修回日期:2011-06-01 发布日期:2011-06-26
  • 通讯作者: 吕艳卓 E-mail:luyanzhuo@yahoo.com.cn
  • 基金资助:

    黑龙江省自然科学基金;中英高校基本科研业务费专项资金

The Electrochemical Performances of Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce Alloys in 0.7 mol•L－1 NaCl Solution

Lü Yanzhuo*,1 Xu Yan2 Wang Xuexin1 Zhang Yi1 Lu Tianhong3   

  1. (1College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001)
    (2Engineering Training Center, Harbin Engineering University, Harbin 150001)
    (3Environmental Friendship Laboratory, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097)
  • Received:2010-12-06 Revised:2011-06-01 Published:2011-06-26

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采用真空熔炼法制备了铸态Mg-8Li, Mg-8Li-0.5Ce和Mg-8Li-1Ce三种Mg-Li合金. 采用Tafel极化曲线、恒电势氧化法和电化学阻抗谱法, 研究了Mg, Mg-8Li, Mg-8Li-0.5Ce和Mg-8Li-1Ce电极作为Mg-H2O2半燃料电池的阳极材料在 0.7 mol•L－1 NaCl溶液中的电化学行为. 采用扫描电镜观测了电极放电前后的表面形貌. 研究结果表明: 在四种金属电极中, Mg-8Li-1Ce电极的腐蚀电位最正(－1.49 V), Mg电极的腐蚀电位最负(－1.66 V)|在0.7 mol•L－1 NaCl溶液中, 电极的电氧化活性排列顺序表示为: Mg-8Li＞Mg-8Li-1Ce＞Mg＞Mg-8Li-0.5Ce, 在－1.0 V电位下, Mg-8Li电极的放电电流密度约为40 mA•cm－2. 表明Mg-8Li电极的电氧化活性最好, Li元素对Mg电极起到了“活化”作用.

关键词: Mg-Li合金, Mg-H2O2半燃料电池, 阳极材料, 电氧化活性

Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce alloys were prepared using vacuum induction melting method. The electrochemical performances of Mg, Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce electrodes as the anodes of Mg-H2O2 semi-fuel cells in 0.7 mol•L－1 NaCl solution were investigated by means of potentiodynamic polarization, potentiostatic discharge and electrochemical impedance spectroscopy measurements. The surface morphology of the electrodes was observed by scanning electron microscopy. The results showed that the corrosion potential of Mg-8Li-1Ce (－1.49 V) is the most positive and the corrosion potential of Mg (－1.66 V) is the most negative among the four electrodes. The electro-oxidation activity of the electrodes in 0.7 mol•L－1 NaCl solution follows the sequence: Mg-8Li＞Mg-8Li-1Ce＞Mg＞Mg-8Li- 0.5Ce. The current density of Mg-8Li electrode discharged at －1.0 V reached around 40 mA•cm－2. The electro-oxidation activity of Mg-8Li is the highest among the four electrodes and the Li element “activated” Mg electrode.

Key words: Mg-Li alloy, Mg-H2O2 semi-fuel cell, anode material, electro-oxidation activity