成果報告書詳細
管理番号20110000001599
タイトル平成18年度~平成19年度成果報告書 水素安全利用等基盤技術開発事業の国際共同研究
公開日2011/11/9
報告書年度2006 - 2007
委託先名学校法人東海大学
プロジェクト番号P03015
部署名燃料電池・水素技術開発部
和文要約本研究では、従来の結晶化学的制約のひとつである”2.0 Åの規則”によらない、最隣接水素原子間距離が約1.6 Åに達する、新しいタイプの水素吸蔵合金において、その水素吸収機構を明らかにし、さらに高体積密度・軽量化した水素貯蔵合金の探索を目的とした。軽量化を目指した合金系として、YNiIn金属間化合物を作製し、水素吸収特性を考察した。P-C-T測定の結果によれば、0.6
英文要約Title:International Joint Research Project “Development of Safe Utilization Technology and an Infrastructure for Hydrogen Use” Advanced Metal Hydrides with High Volume Density of Hydrogen (FY2006-FY2007) Final Report
In metal-H2 systems, the partial step dissociative chemisorption H2→H on the surface is frequently the rate determining step from a point of view of Gas-Solid reactions. For achieving the high H packing density in the metal hydride storage material, on the other hand, several rules of crystal chemistry are useful to estimate the limits of H accommodation in metal matrices. Both “Surface Process” and “Bulk Process” should be addressed in parallel towards development of the efficient applications of metal hydrides as hydrogen storage media. The objective of this project is to study on the mechanism of hydrogen bonding in the novel intermetallic hydrides with high local volume content of hydrogen containing short H…H separations around 1.6 Å, and in proposing the materials where the overall volume content of hydrogen is high density of hydrogen. Upon substitution of R by chemically related metal, Y, the sample YNiIn adopts ZrNiAl-type structure. The value of c/a is rather similar to the compounds of the heavier RNiIn (RE=Tb, Dy, Ho, Er, Tm), where the hydrogenation process does not take place even at hydrogen pressures up to 10 MPa. The YNiIn compound, however, absorbs hydrogen significantly up to a maximum amount of x=1.3 in YNiInHx. TDS spectra show presence of multiple peaks, including one corresponding top a decomposition of the short H…H pair. The H…H separation in YNiInH1.33 could be reduced compared to RNiInH1.33 since c/a ratio in YNiIn is pronouncedly smaller than the one in RNiIn compounds. More detailed information on the hydrogen coordination in the metal sublattice will be received from the structural studies by in situ powder neutron scattering under high D2 pressures. The other type of the prospective material YMgIn has the same type of crystal structure, which gives good opportunities to increase the weight content of hydrogen in the hydride formed. Two structural modifications, ZrBeSi-type and ZrNiAl-type, have been found for the YMgIn intermetallic compound. Based on P-C-T measurements for the systems YMgIn (ZrBeSi-type)-H2, the isotherm show clear plateau regions representing the (YH2+MgIn)-(YH3+MgIn) transition around H/YMgIn<3 and the (YH3+MgIn)-(YH3+MgH2+In) in the range of 3
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