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

电化学和新能源 上一篇    下一篇

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. 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. 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:

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

MSC2000: 

  • O646