热处理对La4MgNi19储氢电极合金结构和性能的影响

doi:10.3866/PKU.WHXB20110133

物理化学学报 >> 2011, Vol. 27 >> Issue (01): 103-107.doi: 10.3866/PKU.WHXB20110133

热处理对La₄MgNi₁₉储氢电极合金结构和性能的影响

邓安强¹, 樊静波¹, 钱克农¹, 罗永春²

1. 宁夏大学机械工程学院, 银川750021;
2. 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, 兰州730050

收稿日期:2010-08-20 修回日期:2010-11-07 发布日期:2010-12-31
通讯作者: 樊静波 E-mail:jingbofan@163.com
基金资助:
宁夏自然科学基金(NZ0918)及国家民委粉体材料与特种陶瓷瓷重点实验室开放基金(0902)资助项目

Effect of Heat Treatment on the Structure and Properties of La₄MgNi₁₉ Hydrogen Storage Electrode Alloys

DENG An-Qiang¹, FAN Jing-Bo¹, QIAN Ke-Nong¹, LUO Yong-Chun²

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

Received:2010-08-20 Revised:2010-11-07 Published:2010-12-31
Contact: FAN Jing-Bo E-mail:jingbofan@163.com
Supported by:
The Project was supported by the Natural Science Foundation of Ningxia, China (NZ0918) and Open Foundation in Key Laboratory of Powder Materials and Special Ceramics, China (0902).

摘要/Abstract

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.

关键词: 储氢, La₄MgNi₁₉合金, 相结构, 电化学性能, 退火

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 °C consisted of a main LaNi₅ phase and a few unknown phases while the alloys obtained from the annealing treatment at 900 ° C 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 is 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.

Key words: Hydrogen storage, La₄MgNi₁₉ alloy, Phase structure, Electrochemical property, Annealing

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(01), 103-107. doi: 10.3866/PKU.WHXB20110133

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 Phys. -Chim. Sin. 2011, 27(01), 103-107. doi: 10.3866/PKU.WHXB20110133

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20110133

https://www.whxb.pku.edu.cn/CN/Y2011/V27/I01/103

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热处理对La₄MgNi₁₉储氢电极合金结构和性能的影响

Effect of Heat Treatment on the Structure and Properties of La₄MgNi₁₉ Hydrogen Storage Electrode Alloys

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