| 热处理对La4MgNi19储氢电极合金结构和性能的影响 |
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| 引用本文： | 邓安强,樊静波,钱克农,罗永春.热处理对La4MgNi19储氢电极合金结构和性能的影响[J].物理化学学报,2011,27(1):103-107. |
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| 作者姓名： | 邓安强 樊静波 钱克农 罗永春 |
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| 作者单位： | 1. College of Mechanical Engineering, Ningxia University, Yinchuan 750021, P. R. China;
2. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, P. R. China |
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| 基金项目： | 宁夏自然科学基金，国家民委粉体材料与特种陶瓷重点实验室开放基金，宁夏大学科学研究基金 |
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| 摘 要： | 以感应熔炼和不同的热处理工艺制备了La4MgNi19合金, 用X射线衍射(XRD)和电化学测试系统研究了该合金的相结构和电化学性能. 结构分析表明: 当热处理工艺为900 °C+水淬时, 合金主要由CaCu5结构的LaNi5相和少量未知相组成; 当热处理工艺为900 °C退火时, 合金主要由Pr5Co19、Ce5Co9结构的(La, Mg)5Ni19相及少量CaCu5结构的LaNi5相组成. 淬火和退火后合金的电化学循环稳定性(S100)分别为49.7%及76.0%, 合金电极的电化学性能和相结构密切相关. 退火热处理有利于生成Pr5Co19、Ce5Co9型相. 在La-Mg-Ni 系储氢合金中, La4MgNi19合金电化学循环稳定性不及La3MgNi14合金.
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| 关 键 词： | 储氢 La4MgNi19合金 相结构 电化学性能 退火 |
| 收稿时间： | 2010-08-20 |
| 修稿时间： | 2010-11-07 |
Effect of Heat Treatment on the Structure and Properties of La4MgNi19 Hydrogen Storage Electrode Alloys |
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| DENG An-Qiang,FAN Jing-Bo,QIAN Ke-Nong,LUO Yong-Chun.Effect of Heat Treatment on the Structure and Properties of La4MgNi19 Hydrogen Storage Electrode Alloys[J].Acta Physico-Chimica Sinica,2011,27(1):103-107. |
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| Authors: | DENG An-Qiang FAN Jing-Bo QIAN Ke-Nong LUO Yong-Chun |
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| Institution: | 1. College of Mechanical Engineering, Ningxia University, Yinchuan 750021, P. R. China;
2. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, P. R. China |
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| Abstract: | La4MgNi19 alloys were prepared by induction melting under different heat treatment conditions.Phase structures and electrochemical properties of the alloys were investigated systematically by X-ray diffraction(XRD) and electrochemical experiments.A structural analysis of the alloys showed that all the alloys were composed of multiphases and the alloys obtained after water quenching at 900 ℃ consisted of a main LaNi5 phase and a few unknown phases while the alloys obtained from the annealing treatment at 900 ℃ consisted of Pr5Co19-type,Ce5Co19-type and few LaNi5 phases.The electrochemical cyclic stability(S100) of the water quenched and the anneal-treated alloys was 49.7% and 76.0%,respectively.The cyclic stability of the alloy electrodes was closely related to the phase structures.Annealing treatment was beneficial for the formation of Pr5Co19-type and Ce5Co19-type phases,La4MgNi19 alloys had worse electrochemical cycling stability than the La3MgNi14 alloys from the La-Mg-Ni system’s hydrogen storage alloys. |
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| Keywords: | Hydrogen storage La4MgNi19 alloy Phase structure Electrochemical property Annealing |
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