| Project/Area Number |
16074212
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
KITAGAWA Hiroshi Kyushu University, Department of Chemistry, Professor (90234244)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAUCHI Miho Kyushu University, Department of Chemistry, Assistant Professor (10372749)
YAMADA Teppei Kyushu University, Department of Chemistry, Assistant Professor (10404071)
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| Project Period (FY) |
2004 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥59,200,000 (Direct Cost: ¥59,200,000)
Fiscal Year 2007: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2006: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2005: ¥44,500,000 (Direct Cost: ¥44,500,000)
Fiscal Year 2004: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | Coordination Space / Energy Device / Fuel Cell / Proton Conductor / Mixed conductor / 混合伝導 / 環境材料 / 構造・機能材料 / ナノ材料 / 複合材料・物性 / 固体イオニクス / 配位高分子 / 金属錯体 / 固体電解質 / プロトン共役レドックス / プロトニクス |
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| Research Abstract |
1) hydrogen-storage nano-materials : Hydrogen storage materials are indispensable for usage of hydrogen energy. Metal nanoparticles, which exhibit different properties from bulk metals, have potential for new functional materials. Since the metal nanoparticles possess large surface area, they are expected to dissociate hydrogen molecules easily and absorb hydrogen at lower temperature and lower pressure. The metal nanoparticles is, therefore, a candidate for a novel hydrogen reservoir. In this study, we prepared the Pd nanoparticle with small size-dispersion and investigated its pressure-composition isotherms and structural change during hydrogen absorption in detail. Mono-dispersed palladium nanoparticles coated with polymer have been prepared and their hydrogen absorption properties were investigated. The averaged diameter of the prepared particles was estimated to be 2.6±0.4nm from a TEM photograph. By measurement of hydrogen pressure-composition isotherms, the hydrogen solubility o
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f the Pd particles was determined to be 0.45 H per Pd. In the isotherms, plateau-like region was observed in the temperature rang of 303 to 393 K, indicating the coexistence of solid solution and hydride phases in the Pd nanoparticles in this temperature region.
2) highly proton-conductive coordination polymers : Room-temperature proton conductivity, coordination geometry, and pore-diameter distribution of the title Cu (II) coordination polymer have been investigated by AC conductivity, EXAFS, and N2 adsorption isotherm measurements. The AC proton conductivity (σp) obtained from Cole-Cole plot analysis under relative humidity of 75 % and 300 K exhibits a considerable high value of 10-6 S cm-1 as a room-temperature σp. The mechanism of proton conduction seems to be similar to that of a proton-exchange membrane, Nafion, which contains much cluster of water molecules in the porous space of the polymer. The present Cu coordination polymer was revealed to possess porous space of about 6 A, which includes much water molecules more than 10H20 per unit cell. The dimeric Cu (II) square-planar coordination geometry was confirmed by EXAFS analysis using synchrotron radiation source at SPring-8. Less
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