| PuNi3和Ce2Ni7型贮氢合金电极容量衰减的交流阻抗谱分析 |
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| 引用本文： | 罗永春,蔡秀娟,阎汝煦,王大辉,康龙.PuNi3和Ce2Ni7型贮氢合金电极容量衰减的交流阻抗谱分析[J].兰州理工大学学报,2007,33(4):13-17. |
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| 作者姓名： | 罗永春 蔡秀娟 阎汝煦 王大辉 康龙 |
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| 作者单位： | 1. 兰州理工大学,材料科学与工程学院,甘肃,兰州,730050;兰州理工大学,甘肃省有色金属新材料省部共建国家重点实验室,甘肃,兰州,730050
2. 兰州理工大学,材料科学与工程学院,甘肃,兰州,730050 |
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| 基金项目： | 国家自然科学基金(50171021) |
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| 摘 要： | 测试不同循环状态下PuNi3和Ce2Ni7型贮氢合金电极在放电深度为50%条件下的电化学交流阻抗谱,分析电极反应的等效电路图.结果表明,随循环次数的增加,PuNi3型合金和Ce2Ni7型合金电极的表面电荷反应阻抗(R4)和接触阻抗(R2,R3)均随循环次数的增加呈先减小后增大的趋势,且PuNi3型合金电极表面电荷反应阻抗(R4)较Ce2Ni7型合金电极先达到最小值.在后期循环过程中,PuNi3型合金电极的表面电荷反应阻抗(R4)及颗粒之间的接触阻抗(R2,R3)均明显大于Ce2Ni7型合金电极,这说明PuNi3型合金电极在循环过程中的腐蚀与粉化均比Ce2Ni7型合金电极严重.
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| 关 键 词： | PuNi3型和Ce2Ni7型贮氢合金 电化学交流阻抗谱 循环寿命 |
| 文章编号： | 1673-5196（2007）04-0013-05 |
| 修稿时间： | 2007-01-10 |
Analysis of alternating current impedance spectrum of capacity of PuNi3 and Ce2Ni7-type hydrogen storage alloyed electrodes |
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| LUO Yong-chun,CAI Xiu-juan,YAN Ru-xu,WANG Da-hui,KANG Long.Analysis of alternating current impedance spectrum of capacity of PuNi3 and Ce2Ni7-type hydrogen storage alloyed electrodes[J].Journal of Lanzhou University of Technology,2007,33(4):13-17. |
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| Authors: | LUO Yong-chun CAI Xiu-juan YAN Ru-xu WANG Da-hui KANG Long |
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| Institution: | 1. College of Materials Science and Engineering, Lanzhou Univ. of Tech. , Lanzhou 730050, China;2. State Key Lab. of Gansu Advanced Non-ferrous Metal Materials, Lanzhou Univ. of Teeh. , Lanzhou 730050, China |
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| Abstract: | Electrochemical alternate impedance spectroscopy(EIS) of PuNi3 and Ce2Ni7-type hydrogen storage alloyed electrodes was measured at different cyclic conditions under the same depth of discharge(50%DOD).Equivalent circuit of the electrode was analysed.The results showed that the both of surface reaction resistance(R4) and contact resistance(R2,R3) decreased at first and then increased with the cycle numbers;the least magnitude of surface reaction resistance of PuNi3-type metal hydride electrode was reached earlier than Ce2Ni7-type metal hydride;The both of surface reaction resistance and contact resistance of PuNi3-type metal hydride electrode were remarkably larger than those of Ce2Ni7-type metal hydride during further cycling process,so that which indicated that the cauterization and pulverization of PuNi3-type metal hydride electrode were worse than those of Ce2Ni7-type metal hydride electrode. |
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| Keywords: | PuNi3-and Ce2Ni7-type hydrogen storage alloy electrochemical alternate impedance spectrum cyclic life |
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