The Electrochemical Performances ofMg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce Alloys in 0.7 mol•L－1 NaCl Solution
Lü Yanzhuo*,1XuYan2 Wang Xuexin1 Zhang Yi1 Lu Tianhong3
(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)
Abstract：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.