| Project/Area Number |
25420756
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Hiroshima University |
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Principal Investigator |
Ishimatsu Naoki 広島大学, 理学(系)研究科(研究院), 助教 (70343291)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 金属水素化物 / パラジウム / X線吸収分光法 / 電子状態 / 水素貯蔵合金 |
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| Outline of Final Research Achievements |
Hydrogenation of Pd-TM alloys (TM=Ru, Rh, Ag, and Au) is investigated in terms of the electronic states of the alloys. For this purpose, the electronic states before and after hydrogenation have been probed by X-ray absorption spectroscopy (XAS) at the L2,3-edges. The relationship between the element-selective electronic structure and thermodynamic hydrogenation property has been discussed. Spectral changes near the absorption edge demonstrate that both Pd and TM atoms bond with H atoms in the Pd-TM (TM=Ru, Rh) alloys, whereas only Pd atoms bond with H atoms and the TM-H bond is absent in the case of Pd-TM (TM=Ag, Au) alloys. Therefore, the hydrogenation effect on the d electronic state differs between TMs with fully occupied and partially occupied d shells. The thermodynamic hydrogenation property of Pd-TM alloys is interpreted by the appearance of TM-H bond and lattice expansion or compression with respect to the lattice constant of the Pd metal.
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