Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 482, Issue 1-2, Pages 388-392Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.04.028
Keywords
Hydrogen storage; MgH2 nanoparticles; Ni nanoparticles; Catalyst
Categories
Funding
- National Natural Science Foundation of China [20221101, 20671004]
- MOST of China [2006AA05Z130]
- MOE of China [707002]
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Mg and Ni nanoparticles were prepared by hydrogen plasma-metal reaction (HPMR). MgH2 nanoparticles were obtained by hydriding the Mg nanoparticles. Hydrogen storage kinetics of the MgH2 nanoparticles doped with different amount of Ni nanoparticles was investigated by differential scanning calorimetry (DSC) and hydrogen desorption rate measurements. The obtained samples show superior hydrogen storage kinetics. 6.1 wt% hydrogen is desorbed in 10 min at 523 K under an initial pressure of 0.01 bar of H-2 when the proportion of Ni narroparticles is 10 wt%. The desorption rate increases when enhancing the amount of catalyst. However, the activation energy of desorption does not decrease any more when the amount of Ni exceeds a value. The enhanced desorption kinetics are mainly attributed to the accelerated combination process of hydrogen atoms by the Ni nanoparticles on the surface of MgH2. (C) 2009 Elsevier B.V. All rights reserved.
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