| 稀土对La0.6R0.2Mg0.2（NiCoAlMn）3.3储氢合金相结构和电化学性能的影响 |
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| 引用本文： | 邹欣伟,张敏刚,孙钢. 稀土对La0.6R0.2Mg0.2（NiCoAlMn）3.3储氢合金相结构和电化学性能的影响[J]. 特种铸造及有色合金, 2011, 31(3): 255-259,193. DOI: 10.3870/tzzz.2011.03.021 |
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| 作者姓名： | 邹欣伟 张敏刚 孙钢 |
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| 作者单位： | 太原科技大学材料科学与工程学院 |
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| 基金项目： | 太原科技大学校青年科学基金资助项目 |
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| 摘 要： | 以La0.6R0.2Mg0.2Ni2.8Co0.2Al0.2Mn0.1(R=La、Ce、Pr、Nd、Y)合金为研究对象,研究稀土元素R部分替代La后对合金相结构和相组成及电化学性能的影响。X射线衍射(XRD)和显微电子探针(EPMA)方法分析结果表明,合金La0.8Mg0.2Ni2.8Co0.2Al0.2Mn0.1退火组织主要由Ce2Ni7型相(或Gd2Co7型)、PuNi3型相和CaCu5型相组成;Pr、Ce、Nd元素的替代对合金的相组成没有明显影响,而Y元素替代使合金中CaCu5型相明显减少,Ce2Ni7型(或Gd2Co7型)相显著增加,其相丰度达到79.03%。Y元素替代时合金中Gd2Co7型相基本消失。电化学测试和分析表明,稀土元素R替代La后对合金电极活化性能影响不大,其中Pr、Nd、Y部分替代La在一定程度上提高了合金的最大放电容量,而元素Y替代时合金电极容量最高达到392.6mAh/g;Y元素部分替代La使合金电极的循环稳定性得到明显提高,S100达到90.3%。
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| 关 键 词： | 稀土-镁-镍基储氢合金 微观组织 电化学性能 |
Structure and Electrochemical Properties of La0.6 R0.2Mg0.2(NiCoAlMn)3.3 Hydrogen Storage Alloys |
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| Zou Xinwei,Zhang Mingang,Sun Gang. Structure and Electrochemical Properties of La0.6 R0.2Mg0.2(NiCoAlMn)3.3 Hydrogen Storage Alloys[J]. Special Casting & Nonferrous Alloys, 2011, 31(3): 255-259,193. DOI: 10.3870/tzzz.2011.03.021 |
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| Authors: | Zou Xinwei Zhang Mingang Sun Gang |
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| Affiliation: | Zou Xinwei,Zhang Mingang,Sun Gang (School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,China) |
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| Abstract: | La0.6R0.2Mg0.2(NiCoAlMn)3.3 hydrogen storage alloys were prepared by induction melting and then treated by annealing process, and effects of rare earth R (R is La, Ce, Pr, Nd and Y) substituted for La on the structure and electro-chemical properties were investigated by XRD (X-ray diffraction) and EPMA. The results reveal that the La0.6R0.2Mg0.2(NiCoAlMn)3.3 hydrogen storage alloys consist of CaCu5-type phase as matrix and Ce2Ni7 and PuNi3-type as secondary phase. Addition of Ce, Pr, Nd is not changed the p... |
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| Keywords: | La-R-Mg-Ni Based Hydrogen Storage Alloy Microstructure Electrochemical Property |
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