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

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

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 Date: 20 August 2010
Available Online: 15 December 2010
Fund Project: 宁夏自然科学基金(NZ0918) (NZ0918)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 (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.
- Hydrogen storage,
- La₄MgNi₁₉ alloy,
- Phase structure,
- Electrochemical property,
- Annealing
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Effect of Heat Treatment on the Structure and Properties of La₄MgNi₁₉ Hydrogen Storage Electrode Alloys