Development of visible-light-driven photocatalysts via an interfacial photoexcitation process
| Project/Area Number |
21J12070
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
WARDHANA AUFANDRA CAKRA 東京工業大学, 物質理工学院, 特別研究員(PD)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Photoelectrochemistry / Photocathode / Water splitting / Photocatalyst / Nanoclusters / Interfacial excitation / KPFM / Photodeposition / Thin film |
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| Outline of Research at the Start |
One-step interfacial charge excitation phenomenon under visible-light irradiation is demonstrated by a well-defined Cr2O3/SrTiO3 system. This study is aimed at explaining the charge transport path, and hence the photocatalytic redox site. To elucidate the charge transport direction, a kelvin probe microscope (KPFM) integrated with visible-light sources is employed. The later is verified by photo-depositing certain metals and metal oxides. Finally, this study provides us a direct evidence of the phenomenon and an alternative to a rationally designed visible-light-active photocatalyst.
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| Outline of Annual Research Achievements |
Our current findings imply that we can control p- (cathodic photoresponse) or n-type (anodic photoresponse) conductivity by a facile surface modification, instead of complicated crystal structure modifications. We have studied interfacial charge transfer (IFCT) in three-electrode photoelectrochemical system for fuel production under UV and visible-light illumination. In this study, we have investigated Cu(II)/TiO2 photo-electrode, and cathodic photoresponse was observed. H2 and O2 evolution were detected from Cu(II)/TiO2 photocathode and Pt sheet, respectively, indicating that water splitting reaction occurred without any addition of sacrificial agent. Considering the concept of IFCT, a direct electron excitation from the valence band of TiO2 to Cu(II) nanoclusters initiated water splitting reaction. On the other hand, Cr(III)/SrTiO3 photo-electrode exhibited anodic photoresponse, indicating that O2 evolution took place on this photoanode; in this case, electrons were directly excited from Cr(III) nanoclusters to the conduction band of SrTiO3 (reversed transfer path). We expect this research would be promising to further examine the direct interfacial charge transfer, not only for photocatalyst but also for other applications.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(4 results)
