2018 Fiscal Year Annual Research Report
Development of New Mg-Based Hydrogen Storage Materials by Binding-Energy Engineering
| Project/Area Number |
16H04539
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| Research Institution | Kyushu University |
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Principal Investigator |
エダラテイ カベー 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (60709608)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Keywords | Hydrogen Storage |
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| Outline of Annual Research Achievements |
Experiments using the high-pressure torsion (HPT) method were employed to synthesize high-pressure gamma phase of MgH2 which has theoretically a lower hydrogen binding energy than the stable alpha phase. Theoretical calculations were also conducted by first-principles calculations to clarify the effect of crystal structure on hydrogen binding energy. It was found that the high-pressure phase has lower dehydrogenation temperature due to its lower hydrogen binding energy in good agreement with the first-principles calculations. These results confirmed that crystal structure modification can be as effective as chemical modification to reduce the hydrogen binding energy and produce low-temperature hydrogen storage materials.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The progress of project was better than the expectation. The target of the project was to design and synthesize Mg-based hydrogen storage materials for room-temperature hydrogen storage which was achieved by chemical modifications. We further extended the research plane to the concept of crystal structure modification. The progress of research beyond the initial targets was due to significant national and international collaborations with experts on materials science, chemistry and first-principles calculations. The project will continue further to have a combination of both low-temperature hydrogen storage and high storage capacity by employing both chemical and crystal structure modifications.
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| Strategy for Future Research Activity |
We are now working on MgH2-TiH2 system to stabilize new phases with low hydrogen binding energy. Some studies are also going on multi-component Mg-based and Ti-based alloys. We try to combine both strategies of chemical modification and crystal structure modification to reduce the hydrogen binding energy further. For this purpose, Mg-Ti-H system is preliminary investigated and the study is further expanded to other Mg-based or Ti-based hydrogen storage systems. Microstructural and structural features are investigated by Raman spectroscopy, X-ray diffraction and electron microscopy and their hydrogen storage performance are investigated by differential scanning calorimetry and thermogravimetery. First-principles calculation will be employed all through this study.
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