成果報告書詳細
管理番号20160000000262
タイトル*平成27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(国立大学法人九州大学)
公開日2016/10/12
報告書年度2015 - 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 nature of the amide-imide system is between interstitial and inorganic hydrides. Nitrogen atom form the FCC sub-lattice. Alkali and/or alkali earth cations and hydrogen are reversibly introduced and moved out from the nitrogen sub-lattice.
We have investigated the hydrogen desorption properties of the three component composite systems comprised of light metal hydrides MHx and amides M(NH2)y (M=Li, Mg and x, y=1, 2). This is the first attempt to study hydrogen storage properties of the three-component amid/hydride systems. After detailed investigation of four three component systems we have successfully found the Mg(NH2)2-4LiH-LiNH2 composite which is capable of reversibly store ~7 wt% H2.
This fiscal year, various additives to this system have been investigated. It was found that KH significantly reduced the on-set temperature of hydrogen release and showed much faster kinetics than the pristine composite. In addition, cycle ability was improved because ammonia release was significantly reduced. Further studies on the reaction mechanism using in-situ both X-ray diffraction and neutron diffraction/scattering are needed. Other types of additives such as metals and halides/oxides will be investigated.

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. If hydrogen remained can be utilized, this type of alloys may be applied some kinds of FCV. Because Ti-V-Cr alloys are transparent for neutron, Nb-substituted Ti-V-Cr BCC alloy was prepared for neutron diffraction measurements using total neutron scattering spectrometer NOVA at J-PARC. The hydrogen positions in mono-deuterides of Ti0.1V0.6Cr0.2Nb0.1 have been refined using the Rietveld method for the neutron diffraction data. It was found hydrogen occupies both Oz and Tz sites with three times larger thermal parameters. From these data, we assume hydrogen remained in the mono-hydride moves between Oz and Tz sites and this motion stabilizes the hydrogen in the lattice.
The first-principle calculations have been conducted for the Ti-based three component BCC alloys including Ti-V-Al, Ti-V-Ge and Ti-V-Mn. The equilibrium pressures obtained by the first-principle calculation agreed with experimental results in tendency. This means the first principal calculation is significantly effective for exploring the BCC solid solution alloys.
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