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

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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).

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