Hydrogen Storage Materials by the Nanoconfinement effects

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04186
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Meiji University
• Principal Investigator: NOTOMI MITSUO 明治大学, 理工学部, 専任教授 (70218288)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: Mg系水素貯蔵材料

Outline of Final Research Achievements

We aimed to develop a Mg-based hydrogen storage material that utilizes the nanoconfinement effect. First, Mg/Fe-based and Mg/Al-based thin films were fabricated using resistance heating vacuum evaporation and PLD. As a result, the Mg/Fe/Pd multilayer film showed a maximum hydrogen storage capacity of 5.58 wt.%, and the Mg/Al/Pd multilayer film showed a maximum hydrogen storage capacity of 3.0 wt.%. Next, Mg-Fe-carbon compound powder was prepared using a mechanical alloying method. As a result, Mg-C60-Fe powder is up to 3 wt.%, Mg-Fe-Gr powder is up to 4 wt.%, Mg-Fe-Graphene powder is up to 4 wt.%, Mg-Fe-reduced Graphene oxide powder showed a hydrogen storage capacity of 4 wt.%.

Free Research Field

機械材料

Academic Significance and Societal Importance of the Research Achievements

水素貯蔵材料の開発にはNanoconfinement効果が有力視され，従来の水素貯蔵量を凌駕する報告もある。そこで，この効果を活かすために，積層薄膜と粉体という二つのアプローチをとり，水素貯蔵量がMgの理論吸蔵量に近づきつつ，水素放出温度の約100℃の低減と水素放出速度の大幅な改善が達成できることを示した．これは今後の水素貯蔵材料開発指針を示すものである．さらにこの知見は水素窒素分離膜の開発に活かすことができると考え，まずはベースとなる高分子材料の水素透過度測定を行い，その方向性を示すことができた．