| Project/Area Number |
04555182
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | University of Tokyo |
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Principal Investigator |
KUDO Tetsuichi Institute of Industrial Science University of Tokyo, Professor, 生産技術研究所, 教授 (90205097)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAKAMI Akira Hitachi Maxell, Ltd., 技術本部, 主任研究員
KISHIMOTO Akira Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo,, 工学部・工業化学科, 講師 (30211874)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥11,300,000 (Direct Cost: ¥11,300,000)
Fiscal Year 1993: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1992: ¥7,300,000 (Direct Cost: ¥7,300,000)
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| Keywords | Peroxopoly-acid / Electrochromism / Spin-coating / Solid state ionics / Amorphous / Proton conductivity / Prussian blue / ポリ酸 / 非晶質 / 薄膜 / 調光素子 |
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| Research Abstract |
(1).Development and Evaluation of New Electrochromic films
Peroxo-polymolybdotungstates are formed by the direct reaction of a mixture of metallic Mo and W (for example, 5 : 5 mixture) with hydrogen peroxide solution. A homogeneous and amorphous thin film (0.4 mum, typically) is fabricated on an ITO glass substrate by spin-coating using such a solution. After heat-treatment at 120 *, it exhibits electrochromism excellent in both reversibilty and response time in an organic Li-electrolyte.
The film colored at -1V (vs. Ag/AgCl) shows rather flat absorption spectrum. Its color is dark grayish blue and the DELTAOD between -1V and +0.5V reaches 0.7 at 670nm (lambda_<max>). Kinetic aspect of such electrochroic films will also be discussed.
(2).Coloration of electrochromic film in contact with polymer electrolyte
Electrochromic thin film of amorphous WO_3・nH_2O was fabricated by spin-coating a peroxo-polytungstate solytion. Coloration and bleaching kinetics of the film incontact with a solid polymer electrolyte were investigated by a chrono-amperometric method using a cell, Li/polymer/WO_3・nH_2O, ITO.The transition currents were analyzed on the basis of a newly proposed theory to be able to describe the diffusion-controlled current generated by a voltage step in such a cell without a reference electrode. It was found that both kinetics were controlled by the diffusion process and the chemical diffusion coefficients of Li were, in common, about 5 x 10^<-12> cm^2/s.
(3).Fabrication and evaluation of an electrochromic window prototype
A new thin film proton conductor based on tantalum oxide was developed from peroxo-tantalic acid. A prototype of electrochromic window in the tungsten oxide/Prussian blue system was fabricated using this conductor as an ion conducting layr. Successful and stable coloration-bleaching performance was demonstrated.
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