2022 Fiscal Year Final Research Report
Fabrication and activity evaluation of electrode catalysts with intermetallic compound nanoclusters uniformly supported on organic molecular substrates
| Project/Area Number |
21K18939
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Keywords | ナノクラスター電極触媒 / 金属間化合物 / 有機分子基板 / 担体表面 |
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| Outline of Final Research Achievements |
Nanoclusters of palladium, platinum, platinum/terbium alloys were synthesized in a gas phase. After selecting the number of atoms and composition with a mass spectrometer, the nanocluster ions were deposited on a substrate pre-decorated by organic molecules. The electronic states were evaluated by x-ray photoelectron spectroscopy and by oxygen gas exposures. By changing the type of organic molecule to electron-donor or electron-acceptor, the charge states of the substrate were designed, resulting in that the reactivity of the nanoclusters against oxygen gas could be controlled by the supporting substrate. The result indicates the importance of the substrate effect; the catalytic activity of the deposited nanoclusters can be controlled by the organic molecule modification. This experimental approach opens up a new molecular science of nanocluster-supported catalysts, in which the number of constituent metal atoms and composition are precisely controlled on an organic substrate.
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| Free Research Field |
物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
表面に予め有機分子蒸着を施すことで担体表面上での均一性を向上させ、分子間相互作用によって触媒の表面拡散の抑制と適切な有機分子による電荷制御で、元素の複合化による合金化と併せて、ナノクラスター触媒の活性化を実現した。この研究は表面担持された合金ナノクラスターに対して基板の担持効果の位置づけを解明し、パラジムや白金、および、その合金ナノクラスターの触媒作用機構を分子論に基づいて理解することに基礎を与えるものである。この成果によって、表面担持ナノクラスターの触媒活性を制御する方策の１つが得られたもので、パラジウムや白金などの希少元素に対して、少ない原子数のナノクラスター触媒が活用される道を拓いた。
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