| Effects of Ti and Zr Substituted on the Electrochemical Characteristics of MgNi-Based Alloy Electrodes |
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| 作者姓名： | 冯艳 焦丽芳 袁华堂 赵明 |
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| 作者单位： | Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China |
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| 基金项目： | Project supported by the National Nature Science Foundation of China （Nos. 50571046, 20573058, 50631020）. |
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| 摘 要： | Mg-based hydrogen storage alloys MgNi, Mg0.9Ti0.1Ni, and Mg0.9Ti0.06Zr0.04Ni were successfully prepared by means of mechanical alloying （MA）. The structure and the electrochemical characteristics of these Mg-based materials were studied. The X-ray diffraction （XRD） result shows that the main phases of the alloys exhibit amorphous structure. The scanning electron microscopy （SEM） photograph shows that the particle size of Ti and Zr substituted alloys was about 2-4 μm in diameter. The cycle lives of the alloys were prolonged by adding Ti and Zr. After 50 charge-discharge cycles, the discharge capacity of Mg0.9Ti0.06Zr0.04Ni was 91.74% higher than that of MgNi alloy and 37.96% higher than that of Mg0.9Ti0.1Ni alloy. The main reason for the electrode capacity decay is the formation of Mg（OH）2 （product of Mg corrosion） at the surface of alloy. The potentiodynamic polarization result indicates that Ti and Zr doping improves the anticorrosion in an alkaline solution. The electrochemical impedance spectroscopy （EIS） results suggest that proper amount of Ti and Zr doping improves the electrochemical catalytic activity significantly.
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| 关 键 词： | 合金 电极 X光线衍射 锰 电化学 循环 |
| 修稿时间： | 2006-09-202006-10-13 |
Effects of Ti and Zr Substituted on the Electrochemical Characteristics of MgNi-Based Alloy Electrodes |
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| FENG, Yan JIAO, Li-Fang YUAN, Hua-Tang ZHAO, Ming.Effects of Ti and Zr Substituted on the Electrochemical Characteristics of MgNi-Based Alloy Electrodes[J].Chinese Journal of Chemistry,2007,25(2):172-175. |
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| Authors: | FENG Yan JIAO Li-Fang YUAN Hua-Tang ZHAO Ming |
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| Institution: | Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, Chia |
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| Abstract: | Mg‐based hydrogen storage alloys MgNi, Mg0.9Ti0.1Ni, and Mg0.9Ti0.06Zr0.04Ni were successfully prepared by means of mechanical alloying (MA). The structure and the electrochemical characteristics of these Mg‐based materials were studied. The X‐ray diffraction (XRD) result shows that the main phases of the alloys exhibit amorphous structure. The scanning electron microscopy (SEM) photograph shows that the particle size of Ti and Zr substituted alloys was about 2–4 µm in diameter. The cycle lives of the alloys were prolonged by adding Ti and Zr. After 50 charge‐discharge cycles, the discharge capacity of Mg0.9Ti0.06Zr0.04Ni was 91.74% higher than that of MgNi alloy and 37.96% higher than that of Mg0.9Ti0.1Ni alloy. The main reason for the electrode capacity decay is the formation of Mg(OH)2 (product of Mg corrosion) at the surface of alloy. The potentiodynamic polarization result indicates that Ti and Zr doping improves the anticorrosion in an alkaline solution. The electrochemical impedance spectroscopy (EIS) results suggest that proper amount of Ti and Zr doping improves the electrochemical catalytic activity significantly. |
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| Keywords: | Mg-based hydrogen storage electrochemical characteristics cycle stability Ti and Zr substitution |
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