| Abstract |
| The cycling characteristics of MgH2 made by hydriding chemical vapor deposition method have been investigated. The particle size of MgH2 made by HCVD was about 1 μm. The cycling experiment was performed by measuring hydrogen quantity absorbed at 673 K and under 35 atm of hydrogen pressure for 30 min. Up to 3 cycles the hydrogen storage capacity increased, but from 4 to 6 cycles the hydrogen storage capacity decreased rapidly. During this cycling test the particle size increased gradually from 1㎛to 6㎛. This increase was due to sintering by the high reaction temperature and the heat of reaction during hydrogen absorption. From 7 to 30 cycles, the hydrogen storage capacity was maintained at 5.8 wt%. Even after 30 cycles, the plateau pressure was constant. |
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| Key Words |
| hydrogen absorbing materials, vapor deposition, hydrogen, X-ray diffraction, magnesium hydride |
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