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Improved hydrogen storage properties of Ti-doped Mg95Ni5 powder produced by hydriding combustion synthesis

Published online by Cambridge University Press:  20 March 2015

Yajun Tan
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, People's Republic of China
Yunfeng Zhu
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, People's Republic of China
Jianguang Yuan
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, People's Republic of China
Liquan Li
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, People's Republic of China
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Abstract

Ti was added to Mg–Ni alloy (Mg95Ni5) by a novel hydriding combustion synthesis (HCS) process. The effect of Ti on hydrogen absorption/desorption kinetics of Mg95Ni5 was investigated. The results showed that Ti had superior catalytic effects on hydrogen storage properties of Mg95Ni5, which required only 80 s to reach its saturated hydrogen absorption capacity of 6.29 wt% at 473 K and released 5.49 wt% hydrogen within 900 s at 553 K. Based on an Arrhenius analysis, the activation energy of the hydrogen desorption process was 80.8 kJ mol−1 for the main phase of MgH2 in the Ti-doped Mg95Ni5. The excellent hydriding/dehydriding properties were related to the existence of TiH1.924, which improved the efficiency of mechanical milling and was helpful in the refinement of the crystallite size of MgH2, resulting in more fresh surface area and grain boundary area. Besides, it was thought to restrain the Mg particles from growth during the hydrogenation/dehydrogenation cycles.

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Copyright © Materials Research Society 2015 

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