Title: Magnesium-nickel hydrogen storage alloys prepared by hydriding combustion synthesis followed by mechanical milling

Authors: Liquan Li, Yunfeng Zhu, Hao Gu, Xiaofeng Liu

Addresses: College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PRC. ' College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PRC. ' College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PRC. ' College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PRC

Abstract: Recent progress is reviewed in the preparation of highly active magnesium-based hydrogen storage alloys by the combined process of Hydriding Combustion Synthesis (HCS) and Mechanical Milling (MM). The structural transformation of the alloys during MM determined by means of X-ray Diffraction (XRD) and the hydrogen storage properties of the alloys measured by means of Pressure-Concentration-Temperature (PCT) are reported. The HCS alloy of Mg₉₈Ni₂ after MM showed the highest hydrogen capacity of 5.60 wt.% at 373 K within 100 s and the dehydriding onset decreased from about 640 K of the HCS product to 480 K of the HCS + MM product. Besides, the absorption capacity at 373 K in 30 s increased from 3.85 wt.% for the HCS + MM product of Mg₉₅Ni₅ without Nb₂O₅ to 5.09 wt.% for that with 1 at.% Nb₂O₅. The results demonstrated that the method of HCS + MM has potential in the preparation of magnesium-based materials for vehicular application.

Keywords: hydrogen storage alloys; hydriding combustion synthesis; HCS; mechanical milling; magnesium; nickel; absorption capacity; vehicle applications; magnesium-based materials.

DOI: 10.1504/IJNHPA.2009.024766

International Journal of Nuclear Hydrogen Production and Applications, 2009 Vol.2 No.2, pp.87 - 98

Published online: 30 Apr 2009 *

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