成果報告書詳細
管理番号20150000000272
タイトル*平成26年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 燃料電池自動車用水素貯蔵材料に関する研究開発
公開日2015/6/16
報告書年度2013 - 2015
委託先名国立大学法人九州大学
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title:Hydrogen Utilization Technology Development (FY2013-FY2015) FY2014 Annual Report

Development of lightweight hydrogen storage materials
1. Development of N-based Hydrogen Storage Systems
 The amide-imide system is between interstitial and complex hydrides. Nitrogen atom occupies the FCC site and cations and hydrogen reversibly introduced and moved out from the nitrogen lattice.
 We have investigated the hydrogen desorption properties of the systems comprised of light metal hydrides MHx and amides M(NH2)y (M=Li, Mg and x, y=1, 2) giving four possible three-component systems. This is the first attempt to study hydrogen storage properties of the three-component amid-imide systems. The hydrogen desorption properties of the systems comprised of three compounds taken from light metal hydrides [MHx] and amides [M(NH2)y] where M=Li, Mg and x, y=1, 2 giving four possible three-component systems, viz., (I) LiNH2-LiH-MgH2, (II) Mg(NH2)2-LiH-MgH2, (III) Mg(NH2)2-LiNH2-MgH2 and (IV) Mg(NH2)2-LiH-LiNH2. After detailed investigation of above four systems we have successfully prepared a Li-Mg-N-H composite in the form of Mg(NH2)2-4LiH-LiNH2 which is capable of reversibly store ~7 wt% H2. The over-all decomposition pathway of Mg(NH2)2-2LiH and LiNH2-2LiH is different from those of these two individual systems. A wide range of possible mole combinations opens up great prospect to explore this avenue of research in the amide-imide based hydrogen storage system to fine-tune the thermodynamics that eventually will be able to repeatedly release > 6 wt% hydrogen quickly within the fuel cell operating temperature without releasing ammonia.

2. Development of Ti-based BCC solid solution alloys
 Ti-based BCC alloys have the maximum hydrogen capacity around 4wt% at ambient conditions. However, reversible capacity and cycle ability are issues to be improved. In the case of Ti-V-Cr BCC alloy, more than 1 wt% of absorbed hydrogen remains in the material after the first dehydrogenation. Because Ti-V-Cr alloys are transparent for neutron, Nb-substituted Ti-V-Cr BCC alloy was prepared for neutron diffraction measurements using neutron scattering spectrometer NOVA at J-PARC. Pure mono-deuterides of Ti0.3V0.3Cr0.3Nb0.1 and Ti0.1V0.6Cr0.2Nb0.1 have been prepared and formation of the BCT structured mono-deuterides has been confirmed. Measurements are delayed because of an accident in J-PARC facility.
Regarding the Ti-V-Mn BCC alloy, Al-substituted alloys have been investigated to improve both of reversible and maximum capacities. When the chemical composition of Ti1.1V0.9Mn0.8Al0.2, the Ti-V-Mn-Al alloy exhibited reversible hydrogen capacity 2.1wt% at ambient conditions.
The first-principle calculations have been conducted for the Ti-based BCC alloys. The first-principle calculation on pseudo-binary system of TiH2-VH2 has been done and presented at conferences. Neutron scattering and diffraction studies of samples synthesized under this program have been done.
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