| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
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| Outline of Final Research Achievements |
First-principle calculations and CALPHAD methods were combined with experiments to design new hydrogen storage materials with low hydrogen binding energy that can store hydrogen at room temperature. The high-pressure torsion method was used to synthesize the designated materials, resulted in discovery of various Mg-, Ti- and high-entropy-based hydrogen storage materials. Among these materials, Mg4NiPd was one good example which reversibly stored 0.8 wt% hydrogen at room temperature, in agreement with binding energy calculations. The second example was TiZrCrMnFeNi, which showed fast and reversible hydrogen storage at room temperature with 1.7 wt% capacity (30% higher than capacity of commercial rare-earth-based LaNi5). Rare-earth-free TiZrCrMnFeNi stored hydrogen without activation, but many hydrogen storage alloys need an extra activation process. This study showed a clear method to design new room-temperature hydrogen storage materials using the concept of binding energy engineering.
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