| 研究課題/領域番号 |
22KF0343
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| 配分区分 | 基金 |
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| 研究機関 | 東京理科大学 |
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研究代表者 |
田村 隆治 東京理科大学, 先進工学部マテリアル創成工学科, 教授 (50307708)
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| 研究分担者 |
JIN HUIXIN 東京理科大学, 先進工学部マテリアル創成工学科, 外国人特別研究員
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| 研究期間 (年度) |
2023-03-08 – 2025-03-31
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| キーワード | Quasicrystal / Catalytic performance / Water electrolysis |
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| 研究実績の概要 |
This year's research objective is to synthesize small-sized multifunctional quasicrystal (QC) for both thermocatalysis and electrocatalysis applications. Furthermore, the study aims to investigate the influence of QC size and composition variations on catalytic performance.
The primary work is divided into two parts. The first part involves the preparation of three different types of small-sized QC with identical compositions using mechanical milling. The catalytic performance of these small-sized QC, including Al-Cu-Fe, Al-Cu-Ru, Al-Cu-Co, Al-Ni-Co QC, and their approximant phases, was studied for thermocatalytic CO2 reduction reaction. The results indicate that the attachment of active alloy particles on the QC surface plays a more crucial role in enhancing catalytic performance compared to reducing QC size. When the desired product is CO, the Al-Cu-Fe QC exhibits the best catalytic performance, outperforming other intermetallics with similar composition but different structures.
The second part investigates the catalytic performance of small-sized QC with different compositions for the oxygen evolution reaction (OER) in water electrolysis. The results reveal that for electrocatalytic OER, smaller QC particle sizes lead to better catalytic performance when the composition is kept constant. Among them, the performance of sub-micrometer QC-AlCuCo approaches that of commercial RuO2 and surpasses that of metal oxide mixtures, ground particles of pure metal mixtures, as well as two-dimensional QC flakes with the same composition.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Although breakthrough progress has not yet been achieved in the preparation of gradient membranes, significant advancements have been made in the development of multifunctional QC for catalysis. Hydrogen is a compelling alternative to fossil fuel, as it is renewable with the highest gravimetric energy density (142 mJ/kg) among chemical fuels. Water electrolysis is a crucial green hydrogen production method, and the search for efficient and stable electrocatalysts for water electrolysis is an important goal in the energy field and human technological advancement. This year's research has focused on developing practical methods for preparing small-sized QC particles with excellent catalytic performance, expanding the practical applications of QC in both electrocatalysis and thermal catalysis fields. Furthermore, by comparing and studying the influence of QC composition, size, and structural differences with other intermetallics on their catalytic performance, the gaps in theoretical and applied research on QC in the field of electrocatalysis will be filled significantly.
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| 今後の研究の推進方策 |
Next, I plan to utilize Density Functional Theory (DFT) calculations and characterizations to analyze the underlying mechanisms of above experimental phenomena. This includes studying the impact of particle size on OER performance and investigating the differences between QCs, pure metals, and metal oxides. Additionally, by synthesizing intermetallics with similar composition to QC-AlCuCo, I aim to further explore the differences in OER performance between QC and intermetallics, analyzing the impact of different structures on catalytic performance. I also intend to prepare more QC with different compositions, such as Al-Ni-Ru, Al-Pd-Ru, Al-Pd-Mo, to find QC compositions with outstanding catalytic performance. In terms of synthesizing small-sized QC, I plan to refine milling processes to reduce QC sizes further and explore chemical synthesis methods to obtain nanoscale QC.
In addition to researching multifunctional small-sized QC for catalysis, I also plan to experiment with a wet impregnation method to deposit catalytically active metal particles on the surfaces of small QC particles, with their concentration distributed in gradients. This approach aims to investigate the influence of these metal/QC gradient particles on catalytic performance.
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| 次年度使用額が生じた理由 |
Since this fiscal year mainly focused on the design, synthesis, and performance testing of multifunctional quasicrystal catalysts, further experimental characterization tests and mechanism analyses have not been conducted yet. These may involve employing high-resolution scanning transmission electron microscopy, X-ray absorption spectroscopy, electron energy loss spectroscopy (EELS), and X-ray photoelectron spectroscopy (XPS) to characterize the structure, particle size, uniformity of element distribution, and oxidation states of the catalysts. Therefore, I intend to combine the unused funds from this year with a portion of the funds allocated for next year to conduct in-depth research on the QC catalytic mechanisms.
Furthermore, as the laboratory currently has the capability to test both the hydrogen evolution reaction and the oxygen evolution reaction, I plan to allocate resources in the next fiscal year to acquire additional equipment and consumables for testing and analyzing the oxygen reduction reaction.
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