| Project/Area Number |
10450280
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
OKIDO Masazumi Nagoya University, Center for Integrated Research in Science and Engineering, Professor, 理工科学総合研究センター, 教授 (50126843)
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| Co-Investigator(Kenkyū-buntansha) |
KURODA Kensuke Nagoya University, School of Engineering, Department of Materials Science, Assistant Professor, 工学研究科, 助手 (00283408)
ICHINO Ryoichi Nagoya University, School of Engineering, Department of Materials Science, Lecturer, 工学研究科, 講師 (70223104)
魏 大維 名古屋大学, 理工科学総合研究センター, 非常勤研究員
松本 功 松下電池工業株式会社, 技術本部・主幹技師
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥3,700,000 (Direct Cost: ¥3,700,000)
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| Keywords | Hydrogen absorbing alloy / Molten salt electrolysis / Lanthanum / Intermetallic compound / Functional film / Hydride battery / LaNi5 / MgzNi |
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| Research Abstract |
Hydrogen absorbing. alloy, HAA, consists of element A (La, Mg, Ca, Ti, etc) and element B (Ni, Fe, Cu, etc). The elements A, which are generally very active metals, were electrodeposited on substrate B in molten salts and diffused each other to make intermetallic compounds with hydrogen absorbing property. This process for HAA production has an advantage to produce directly from resources of active element A and film type.Lanthanum was electrodeposited on nickel substrate in chloride bath. The phase formed on the substrate depends on electrolysis conditions such as temperature, current density, electrolysis duration, etc. The HAA film, LaNi_5, can be obtained by controlling the electrolysis condition. The charge-discharge property for the HAA films were estimated electrochemically in an alkaline solution at ambient temperature. In La electrolysis, LaNi_5 layer with 25 μm formed on Ni substrate during 0.4 ks under the current density of 0.1 Acm^<-2> at 1023 K.This film showed better cyclic charge-discharge property for hydrogen adsorption/disorption than commercial LaNi5 ingot. The Ni substrate inhibited the embrittlement of HAA film on the surface during charge-discharge test. On the other hand, co-electrodeposition of La and Co on Ni sheet gave LaNi_<5-x>Co_x (X<1%) layer. This Co addition also improved cyclic property.
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