| La0.8-xCexMg0.2Ni3.5(x=0~0.20)贮氢合金电极的低温放电性能 |
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| 引用本文： | 沈向前,陈云贵,陶明大,吴超玲,王 伟,邓 刚. La0.8-xCexMg0.2Ni3.5(x=0~0.20)贮氢合金电极的低温放电性能[J]. 稀有金属材料与工程, 2009, 38(2): 237-241 |
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| 作者姓名： | 沈向前 陈云贵 陶明大 吴超玲 王 伟 邓 刚 |
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| 作者单位： | 四川大学,四川,成都,610064 |
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| 摘 要： | 用冷坩埚磁悬浮熔炼炉制各La0.8-xCexMg0.2Ni3.5(x=0.0.05,0.10,0.15,0.20)贮氢电极合金,采用X射线衍射、三电极体系系统研究合金的微观结构和电化学性能.研究表明:合金为多相结构,主相均为Ce2Ni7型六方相,还包括Cacu5型六方相、PuNi3型菱方相;P-C-T曲线显示,随着Ce含最的增加,合金放氢平台区域变窄,平台压力升高.合金中各组成相单胞体积的减小是其主要原因.随着Ce含量的增加,合金常温最大放电容量逐渐减小并且循环稳定性有一定改善;低温最大放电容量则先增大后减小,合金的低温高倍率放电性能以及交换电流密度均随Ce含量的增加而增加,但氢扩散系数随着Ce含量的增加而减小.
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| 关 键 词： | A2B7型贮氢电极合金 相结构 低温电化学性能 |
| 收稿时间： | 2008-06-30 |
Electrochemical Properties of La0.8-xCexMg0.2Ni3.5 (x=0~0.20) Hydrogen Storage Alloy Electrode at 233 K |
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| Shen Xiangqian,Chen Yungui,Tao Mingd,Wu Chaoling,Wang Wei and Deng Gang. Electrochemical Properties of La0.8-xCexMg0.2Ni3.5 (x=0~0.20) Hydrogen Storage Alloy Electrode at 233 K[J]. Rare Metal Materials and Engineering, 2009, 38(2): 237-241 |
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| Authors: | Shen Xiangqian Chen Yungui Tao Mingd Wu Chaoling Wang Wei Deng Gang |
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| Affiliation: | Sichuan University;Chengdu 610064;China |
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| Abstract: | In this paper, the effects of cerium content on the structural and electrochemical properties of the La0.8-xCexMg0.2Ni3.5 (x=0, 0.05, 0.10, 0.15, 0.20) hydrogen storage alloys have been studied systematically. XRD analyses show that all these alloys consist of hexagonal Ce2Ni7-type main-phase, hexagonal CaCu5-type phase, and rhombohedral PuNi3-type phase. The P-C isotherms curves show that the plateau pressure of the hydrogen desorption increases gradually and the plateau region becomes narrower with increa... |
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| Keywords: | A2B7-type hydrogen storage electrode alloys phase structure low-temperature electrochemical properties |
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