| Project/Area Number |
23K04369
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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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| Project Period (FY) |
2023-04-01 – 2027-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2026: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2025: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2024: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | anodization / charge dynamics / photocatalyst / TNTZ / yolk shell structures / nanotubes |
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| Outline of Research at the Start |
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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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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