| 研究課題/領域番号 |
23K04369
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分26020:無機材料および物性関連
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| 研究機関 | 東京工業大学 |
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研究代表者 |
陳 君怡 東京工業大学, 科学技術創成研究院, 准教授 (90707473)
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| 研究期間 (年度) |
2023-04-01 – 2027-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,810千円 (直接経費: 3,700千円、間接経費: 1,110千円)
2026年度: 650千円 (直接経費: 500千円、間接経費: 150千円)
2025年度: 780千円 (直接経費: 600千円、間接経費: 180千円)
2024年度: 780千円 (直接経費: 600千円、間接経費: 180千円)
2023年度: 2,600千円 (直接経費: 2,000千円、間接経費: 600千円)
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| キーワード | anodization / charge dynamics / photocatalyst / TNTZ / yolk shell structures / nanotubes |
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| 研究開始時の研究の概要 |
We presented a delicate anodization process for the preparation of quaternary Ti－Nb－Ta－Zr－O mixed-oxide (denoted as TNTZO) nanotube arrays. The superior photoactivity of TNTZO nanotubes over pristine TiO2 nanotubes originated from the introduction of Nd, Ta, and Zr elements for water splitting.
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| 研究実績の概要 |
研究成果の概要（英文）：By performing anodization on Ti29Nb13Ta4.6Zr (TNTZ) alloys,Ti-Nb-Ta-Zr-O mixed-oxide nanotube arrays with controllable geometric features were prepared. Compared with pristine TiO2, the TNTZO photoanodes exhibited noticeably enhanced photoactivity toward solar water splitting. The analytic results manifest that the superior photoactivity of TNTZO originated from the introduction of Nd, Ta, and Zr elements, which enhanced
the amount of accessible charge carriers, modified the electronic structure, and improved the hole-transfer kinetics for expediting water splitting. Furthermore, reducing the water content of the electrolyte to 0.9 vol % generated TNTZO nanotubes that can be fully depleted during photoelectrochemical (PEC) operations.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Our research has achieved significant progress in the development of TNTZO nanotubes as visible light photocatalysts. Moreover, we have further advanced our work by synthesizing Au@Cu7S4 yolk@shell nanostructures. Under near-infrared (NIR) irradiation, the Au@Cu7S4 nanostructures exhibit pronounced localized surface plasmon resonance (LSPR) absorption effects. Due to the ability of Au to facilitate the separation of hot electrons and hot holes in Cu7S4, Au@Cu7S4 demonstrates excellent NIR photocatalytic activity. Specifically, under 2200 nm monochromatic light irradiation, we have achieved a record-breaking apparent quantum yield (AQY) for hydrogen production, reaching 7.3%. This significant achievement has recently been accepted for publication in the journal of Nature Communications.
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| 今後の研究の推進方策 |
For the future work, the combination of TNTZO nanotubes-Au@Cu4S7 yolk@shell structures is expected to exhibit highly efficient photocatalytic activity under light irradiation. Firstly, the band alignment between TNTZO nanotubes and Au@Cu4S7 can effectively promote charge separation, enhancing carrier utilization and improving photocatalytic performance. Secondly, decoration with Au@Cu4S7 can sensitize TNTZO nanotubes to NIR light, increasing solar spectrum absorption and enabling NIR light activity.
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