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
  • 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).


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


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