| La1-xCexNi3.54Co0.78Mn0.35Al0.32贮氢合金相结构和电化学性能的研究 |
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| 引用本文： | 李安铭,呼梦娟,刘宝忠,范燕平,张宝庆,张志.La1-xCexNi3.54Co0.78Mn0.35Al0.32贮氢合金相结构和电化学性能的研究[J].河南理工大学学报(自然科学版),2012(3):334-339. |
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| 作者姓名： | 李安铭 呼梦娟 刘宝忠 范燕平 张宝庆 张志 |
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| 作者单位： | 河南理工大学材料科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助项目(51001043);中国博士后特别资助项目(201104390);中国博士后基金资助项目(20100470990);包头市科技发展计划(2011J1003);河南理工大学博士基金资助项目(B2010-13) |
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| 摘 要： | 采用真空电弧熔炼和热处理方法制备了La1-xCexNi3.54Co0.78Mn0.35Al0.32(x=0.1,0.2,0.3,0.4,0.5,0.6)贮氢合金.X射线衍射(XRD)分析表明,合金含有单一CaCu5型六方结构相.电化学性能测试表明,随着x的增加,合金的最大放电容量从348.1mAh/g(x=0.1)单调地减小到310.1 mAh/g(x=0.6);HRD1200先从28.6%(x=0.1)增加到65.4%(x=0.5)然后降低到60.1%(x=0.6),归因于合金表面的电催化活性和合金体内氢原子扩散速率均随x的增大先增大后减小.
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| 关 键 词： | 贮氢合金 电化学性能 动力学性能 |
The microstructures and electrochemical properties of La1-xCexNi3.54Co0.78Mn0.35Al0.32 hydrogen storage electrode alloys |
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| LI An-ming,HU Meng-juan,LIU Bao-zhong,FAN Yan-ping, ZHANG Bao-qing Zhang,ZHANG Zhi.The microstructures and electrochemical properties of La1-xCexNi3.54Co0.78Mn0.35Al0.32 hydrogen storage electrode alloys[J].JOURNAL OF HENAN POLYTECHNIC UNIVERSITY,2012(3):334-339. |
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| Authors: | LI An-ming HU Meng-juan LIU Bao-zhong FAN Yan-ping ZHANG Bao-qing Zhang ZHANG Zhi |
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| Affiliation: | (School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China) |
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| Abstract: | The hydrogen storage alloys La1-xCexNi3.54Co0.78Mn0.35Al0.32(x=0.1,0.2,0.3,0.4,0.5,0.6) were synthesized by induction melting and heat treatment.XRD analysis indicated that the alloys consisted of a single CaCu5-type phase.The electrochemical performance test showed that with increasing x value,the maximum discharge capacity decreased monotonically from 348.1 to 310.1 mAh/g.For the discharge current density of 1200 mA/g,the HRD of the alloy electrode first increased from 28.6%(x=0.1) to 65.4%(x=0.5),and then decreased to 60.1%(x=0.6).This was mainly attributed to the electrocatalytic activity for charge-transfer reaction at the electrode/electrolyte interface and the hydrogen diffusion in the bulk of alloys,which increased first and then decreased. |
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| Keywords: | Hydregen storage alloy electrochemical performance kinetics performance |
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