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Hydrogen storage properties of mechanically alloyedMg–8 mol% LaNi0.5 composite

Published online by Cambridge University Press:  01 October 2004

Qian Li ,
Qin Lin ,
Kuo-Chih Chou ,
Li-Jun Jiang  and
Feng Zhan
Qian Li*
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100088, People’s Republic of China; and Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing 100083, People’s Republic of China
Qin Lin
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100088, People’s Republic of China
Kuo-Chih Chou
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100088, People’s Republic of China
Li-Jun Jiang
Affiliation:
Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing 100083, People’s Republic of China
Feng Zhan
Affiliation:
Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing 100083, People’s Republic of China
*
a)Address all correspondence to this author.e-mail: [email protected]
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Abstract

A new nano-ternary Mg–8 mol% LaNi0.5 was prepared by melted and subsequent mechanical alloying technique for hydrogen storage. It was found from our experiments that, this kind of alloy had superior hydriding/dehydriding characteristics in comparison with conventional materials for hydrogen storage. It possessed large hydrogen capacity at a lower temperature, which could absorb 4.55–7.01 mass% H under 3 MPa hydrogen pressure and desorb 4.40–6.90 mass% H under 0.0133 MPa in 600 s above 423 K without any activation requirement drawn from our pressure-composition isotherm and kinetic experiments. Through the x-ray diffraction and transmission electron microscopy experiments, we further found that these superior characteristics could be attributed to the multiphase structure and a catalytic effect of LaH3 and Mg2Ni that were formed in the material preparation of mechanical alloying process. Finally, based on these data the relationships between equilibrium pressure of hydrogen and temperature were obtained, they were lgp(0.1 MPa) = −3985/T + 7.188(553 K ⩽ T ⩽ 573K) for hydriding and lgp(0.1 MPa) = −3804/T + 6.770 (553 K ⩽ T ⩽ 573 K) for dehydriding.

Keywords

Intermetallic alloysAbsorptionMechanical alloying
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 10 , October 2004 , pp. 2871 - 2876
Copyright
Copyright © Materials Research Society 2004

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References

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