Mechanistic clarification and de/rehydrogenation improvement of complex hydrides by nanospace

2016 Fiscal Year Final Research Report

• Project/Area Number: 25709067
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Kyushu University
• Principal Investigator: LI HAIWEN 九州大学, 水素エネルギー国際研究センター, 准教授 (40400410)
• Co-Investigator(Renkei-kenkyūsha): AKIBA ETSUO 九州大学, 工学研究院, 教授 (90356345)
• Research Collaborator: HE LIQING
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 水素化物 / イオン電導 / 水素貯蔵

Outline of Final Research Achievements

The improvement effects of nanoconfinement on the de/re-hydrogenation of LiBH4 and 0.68LiBH4－0.32Ca(BH4)2 were systematically investigated. It was found that the 1st dehydrogenation temperature was reduced by the nanoconfinement, whereas such effect disappeared from the 2nd cycle. Anhydrous M(B12H12)n/2, the dehydrogenation intermediate of M(BH4)n was successfully synthesized by sintering of M(BH4)n and B10H14 with stoichiometric molar ratio. Thermal decomposition of M(B12H12)n/2 was proved to proceed in 2 steps, i.e. 1) formation of hydrogen deficient [B12H12-x]n- and 2) formation of polymer comprised of [BxHy]n-. M(B12H12)n/2 was found to exhibit superionic conductivity at its high temperature phase. For example, the ionic conductivity of LiNaB12H12 at 550 K reaches 0.79 S/cm, which is approximately 8 times higher than that of Na2B12H12 and 11 times higher than that of Li2B12H12, suggesting the high potentiality of M(B12H12)n/2 as solid electrolyte.

Free Research Field

材料工学、水素化物