| Popis: |
High-pressure metal hydride (MH) tank is a possible hydrogen storage system for fuel cell vehicles. The merit of the high-pressure MH tank system is improved by the use of a metal hydride with high dissociation pressure. In this study, TiCrV and TiCrVMo alloys with BCC structure have been developed for the system. The developed TiCrVMo alloy shows 2.5mass% of effective hydrogen capacity in the pressure range between 0.1MPa and 33MPa at 298K. In TiCrV, the dissociation pressure of the alloy increases with the decrease of the lattice size. This trend is consistent with a general trend often observed for other metal hydrides. However, for TiCrVMo alloy, the dissociation pressure is sensitive not only to the lattice size but also to the content of Mo. As a result, it turned out that Mo has a special effect to increase the dissociation pressure of the hydride. Combined with the developed TiCrVMo alloy, hydrogen charging/discharging properties as a high pressure MH tank was also investigated. The whole tank system has a potential to store 5kg of hydrogen within 95L and 225kg, which means 0.053kgH2/L and 0.022kgH2/kg as a total system, respectively. |
