| Effects of Ti and Co 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： | [1]institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China [2]Tianjin Institute of Scientific ＆ Technical Information, Tianjin 300074, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Nos. 50571046, 50631020 and 20573058） and 863 program （No. 2006AA05Z110）. |
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| 摘 要： | Mg-based hydrogen storage alloys MgNi, Mg0.9Ti0.1Ni and Mg0.9Ti0.1Ni0.9Co0.1 were successfully prepared by means of mechanical alloying （MA）. The structure and the electrochemical characteristics of these Mg-based materials were also studied. The results of X-ray diffraction （XRD） and scanning electron microscopy （SEM） show that the main phases of the alloys exhibit amorphous structures, and trace of Ni co-exists. The charge-discharge cycle tests indicate these alloys have good electrochemical active characteristics. And the cycle stability of Ti and Co doped alloy was better than that of MgNi alloy. After 50 cycle charge-discharge, the discharge capacity of the Mg0.9Ti0.1Ni0.9Co0.1 alloy was much better than that of MgNi and Mg0.9Ti0.1Ni alloys. The discharge capacity of Mg0.9Ti0.1Ni0.9Co0.1 was 102.8% higher than that of MgNi alloy, and 45.49% higher than that of the Mg0.9Ti0.1Ni alloy. During the process of charge-discharge cycle test, the main reason for the electrode capacity fading is the corrosion of Mg to Mg（OH）2 on the surface of alloys. The Tafel polarization test indicates Ti and Co improve the anticorrosion in an alkaline solution. The EIS results suggest that proper amount of Ti and Co doping improve the electrochemical catalytical activity on the Mg-based alloy surface significantly.
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| 关 键 词： | 电化学特性 循环稳定性 抗腐蚀性 钛元素 钴元素 |
| 修稿时间： | 2006-07-03 |
Effects of Ti and Co 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 Co on the Electrochemical Characteristics of MgNi-Based Alloy Electrodes[J].Chinese Journal of Chemistry,2007,25(9):1278-1281. |
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| Authors: | FENG Yan JIAO Li-Fang YUAN Hua-Tang ZHAO Ming |
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| Institution: | 1. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China;2. Tianjin Institute of Scientific & Technical Information, Tianjin 300074, China;3. Tel.: 0086‐022‐23498089;4. Fax: 0086‐022‐23502604 |
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| Abstract: | Mg‐based hydrogen storage alloys MgNi, Mg0.9Ti0.1Ni and Mg0.9Ti0.1Ni0.9Co0.1 were successfully prepared by means of mechanical alloying (MA). The structure and the electrochemical characteristics of these Mg‐based materials were also studied. The results of X‐ray diffraction (XRD) and scanning electron microscopy (SEM) show that the main phases of the alloys exhibit amorphous structures, and trace of Ni co‐exists. The charge‐discharge cycle tests indicate these alloys have good electrochemical active characteristics. And the cycle stability of Ti and Co doped alloy was better than that of MgNi alloy. After 50 cycle charge‐discharge, the discharge capacity of the Mg0.9Ti0.1Ni0.9Co0.1 alloy was much better than that of MgNi and Mg0.9Ti0.1Ni alloys. The discharge capacity of Mg0.9Ti0.1Ni0.9Co0.1 was 102.8% higher than that of MgNi alloy, and 45.49% higher than that of the Mg0.9Ti0.1Ni alloy. During the process of charge‐discharge cycle test, the main reason for the electrode capacity fading is the corrosion of Mg to Mg(OH)2 on the surface of alloys. The Tafel polarization test indicates Ti and Co improve the anticorrosion in an alkaline solution. The EIS results suggest that proper amount of Ti and Co doping improve the electrochemical catalytical activity on the Mg‐based alloy surface significantly. |
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| Keywords: | Mg-based hydrogen storage electrochemical characteristic cycle stability anticorrosion |
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