成果報告書詳細
管理番号20100000002047
タイトル*平成20年度中間年報 水素製造・輸送・貯蔵システム等技術開発 次世代技術開発・フィージビリティスタディ等 革新的な次世代技術の探索・有効性検証に関する研究開発 超高圧水素合成法による新規水素吸蔵合金の研究開発
公開日2011/5/10
報告書年度2008 - 2008
委託先名独立行政法人産業技術総合研究所
プロジェクト番号P08003
部署名燃料電池・水素技術開発部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 本研究開発は「質量貯蔵密度6質量%以上、放出温度100℃以下、耐久性1,000回以上」を満たす新規高容量水素貯蔵合金の開発を目的として、超高圧合成法による高容量水素化合物の探索とその特性評価を行うものである。具体的には、(1)マグネシウム合金系材料(産総研)、(2)リチウム合金系材料(東北大)、(3)アルミニウム合金系材料(産総研、東北大)を基にした新規水素化物の探索・設計に関する研究を分担して進めている。本中間年報では、産総研が担当している上記(1)及び(3)の内容及び成果について報告する。
英文要約Title: Investigation on high-pressure synthesis of novel metal hydrides with high hydrogen capacity
(FY 2008-2009) FY2008 Annual Report
National Institute of Advanced Industrial Science and Technology
In order to develop new hydrogen storage materials with hydrogen capacity of more than 6 mass% and hydrogen desorption temperature of less than 100°C, many works have been done based on materials of MgH2 and AlH3 due to their high hydrogen capacities. Previously, we synthesized successfully a series of new hydrides Mg7MH14-16 (M= SC, Ti, V, Zr, Nb, Hf, and Ta) with a face-centered cubic (FCC) super-lattice structure under 4-8 GPa pressures at 600°C, and found that hydrogen desorption temperatures for these FCC hydrides are lower by 130-180°C than that of MgH2.
In this year, we have performed the works on the systems of (1) Mg-based metal hydrides and (3) Al-based metal hydride on the purpose to find the new hydrogen storage materials with good hydrogen absorption-desorption properties. (1) Research on the Mg-based metal hydride for hydrogen storage. : (1-1) High pressure synthesis:The new FCC phases in Mg6VH14- xNaH system have been successfully synthesized by heat treatment at 600℃ under 8GPa hydrogen pressure. By doping some content of NaH, the crystal growth of the FCC type of Mg6VH14- xNaH would be remarkable promoted. : (1-2) Evaluation of hydrogen properties : DSC and PCI measurements proved that the higher FCC mass fraction in the sample, the faster hydrogen releasing and restoring kinetics, and also the better reversible hydrogen storage capacities.: (1-3) Structural analysis: Rietveld refinements for the synchrotron XRD data of Mg6NaxVH~15 indicated that the Na atoms take the site of 4b site of the Ca7Ge type structure, while the H atoms take the tetrahedral sites of 32f. Moreover, the preparation ratio of the FCC phase was considerably increased by the doping of NaH, and the highest preparation ratio can reach 82.69 wt% when the initial molar ratio of NaH is 1.0. : (3) Research on the Al-based metal hydride for hydrogen storage : (3-1) High pressure synthesis: Mixture of NaAlH4 and TiH2 with molar ratio of 10:1 and 3:1 were heat treated at 600℃ under 8GPa hydrogen pressure.: (3-2) Evaluation of hydrogen properties: DSC measurement found there is only a endothermic peak appeared at 174.8℃ but no exothermic peak exists, which means that the as-prepared specimen is not reversible for hydrogen desorption and adsorption.: (3-3) Structural analysis: The results of the synchrotron XRD data for the specimen indicated that, after high pressure treatment, the composition includes phases of Na3AlH4 and TiAl3, as well as some content of the raw materials (NaAlH4 and TiH2).
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