Fundamental study on hydrogen storage with hydrogen absorbing alloys

摘要

In recent years, we found that underground resources were limited. And as a result of industrial development environment has greatly changed and we came to advocate the coexistence with the nature. From this point of view, solar energy has come to get an attention as clean energy. Solar energy is extracted from the sunshine which pours on earth endlessly. Recently, hydrogen produced by solar energy has attracted special interest as the clean energy carrier. We have designed and constructed the hydrogen storage tank using hydrogen absorbing alloys of LaNi{sub}5 (1.5)kg) without heat exchanger. As a result, it is found that the absorbing capacity of hydrogen has depended on alloys temperature. The temperature difference between the alloys and the cooling medium would be below 5°C and the pressure between the inside tank and the alloys would be below 1 atm for the best use. Under this condition, absorption efficiency would not be less than 96%.