Study on Hydrogenation Properties and Structures of Composites with Magnesium Hydride and Carbon Nanotubes
Sung-Youp Lee · Jung-Il Park · Hyeong-Rag Lee ∗
Department of Physics, Kyungpook National University, Daegu 702-701, Korea (Received 13 December 2013 : revised 17 December 2013 : accepted 12 February 2014)
In this study, we used the ball-milling process to fabricate composites with various weight ratios of magnesium hydride (MgH
2) to purified carbon nanotubes (CNTs). Then, the hydrogen storage capacities of the composites were evaluated. After hydrogenation, X-ray diffraction measurements were performed at the mixtures, and Rietveld refinements analyzing the structure of MgH
2were carried out. The ratio of the composite changed the sizes of the particles and the crystallites of MgH
2due to physical collisions during the ball-milling process. The results showed that the composite with a 2 : 8 weight ratio of MgH
2to CNTs had the lowest amount of hydrogen adsorption. However, the results also revealed that the composite had the highest speed of hydrogenation when the crystallite size of MgH
2was the smallest (639.3 ˚ A).
PACS numbers: 84.60.Dn, 61.10.Nz, 81.05.Ys
Keywords: Hydrogen storage material, Carbon nanotube, Magnesium hydride, Rietveld refinement
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PACS numbers: 84.60.Dn, 61.10.Nz, 81.05.Ys
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