| Project/Area Number |
19K23650
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0502:Inorganic/coordination chemistry, analytical chemistry, inorganic materials chemistry, energy-related chemistry, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Oxygen-ion mobility / Perovskite structure / Solid state chemistry / Topochemical methods / Structural study / Synchrotron radiation / Rietveld refinement / Layered structures / Solid state synthesis / Topochemical processes / Topochemical synthesis / Perovskite materials / Oxygen deficiency / Structure analysis / Oxide-ion Mobility / Solid State Chemistry / Perovskite Structure / Topochemical Methods |
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| Outline of Research at the Start |
Today, there is a critical need for clean and sustainable energy technologies. Oxide-ion (negatively charged oxygen atoms) conducting materials are promising in applications relevant to such technologies; for example, in high efficiency fuel cells. Metal oxides are abundant on the earth’s crust and when designed in particular structures, they can display significantly high oxide-ion conduction. This research aims to study complex-metal oxides exhibiting oxide-ion conduction at relatively low temperatures as a consequence of the synthesis strategy.
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| Outline of Final Research Achievements |
This project investigated the synthesis and characterization of metal-oxide materials prepared by topochemical (structure preserving) methods. The products of topochemical processes often exhibit oxygen-ion conductivity at moderate temperatures (T < 900 °C). A series of perovskite and perovskite-related materials were successfully prepared by using a combination of reductive/oxidative atmospheres coupled with heating and pressure treatments. The materials exhibit markedly different types of cation and/or vacancy ordering. Their detailed structure and oxygen release/incorporation behavior as a function of temperature were analyzed by synchrotron X-ray diffraction and thermogravimetric techniques.
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| Academic Significance and Societal Importance of the Research Achievements |
近年、新しいクリーンエネルギー源や高エネルギー密度の電池の必要性が高まっており、それらの開発のために特に中低温で動作する新しいイオン伝導材料の研究が盛んに行われている。酸素イオン伝導体は、固体酸化物燃料電池（SOFC）などのデバイスに使用されるキーマテリアルである。本研究の成果は、酸素イオン伝導材料のバリエーションを拡げ、また、構造的特徴を活かすことで酸素イオン伝導を制御する可能性を示すもので、持続可能な社会を支えるSOFC技術を開発することにも繋がります。
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