| Title |
Cycling Characteristics of MgH2 made by Hydriding Chemical Vapor Deposition Method |
| Authors |
박경덕(Kyung Duck Park); 한정섭(Jeong Seb Han) |
| DOI |
https://doi.org/10.3365/KJMM.2011.49.12.945 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
hydrogen absorbing materials; vapor deposition; hydrogen; X-ray diffraction; magnesium hydride |
| 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. |