抄録
In this research, we present the model of the hydrogen storage microcapsule that is constructed with carbon-based materials wrapped in the hydrogen permeable membrane that is produced by a multilayer of transition metals and a substrate. Since carbon-based materials more adsorb hydrogen at low temperature, it is presented that the steps of hydrogen storage in the microcapsule are as follows. First, the microcapsule is introduced hydrogen which permeates through the membrane at high temperature. Second, the carbon-based materials adsorb hydrogen and then the membrane prevents from releasing hydrogen at low temperature. Third, the carbon-based materials and then the microcapsule release hydrogen due to raising temperature and we can use the hydrogen in more safety and efficiently. For such a membrane of the microcapsule, Stainless/Ti/Ni/Ti multilayer is prepared with Pulsed Laser Deposition method and evaluated amount of hydrogen storage against temperature with Pressure-Composition-Temperature curve measurement. The maximum hydrogen contents of the multilayer are 0.0838wt.% at room temperature and 0.573wt.% at 200℃ and those of the stainless film without Ti and Ni layer are 0.193wt.% at room and 0.504wt.% at 200℃. The hydrogen contents of the multilayer are rarely different from the stainless film and it is possible that the membrane can be evaluated hydrogen permeation against temperature with polymeric membrane as its substrate and determination test of gas transmission rate defined in JIS K 7126-1.
