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Development of visible-light-driven photocatalysts via an interfacial photoexcitation process

Research Project

Project/Area Number 21J12070
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

WARDHANA AUFANDRA CAKRA  東京工業大学, 物質理工学院, 特別研究員(PD)

Project Period (FY) 2021-04-28 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
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)
KeywordsPhotoelectrochemistry / Photocathode / Water splitting / Photocatalyst / Nanoclusters / Interfacial excitation / KPFM / Photodeposition / Thin film
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.

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.

Research Progress Status

令和4年度が最終年度であるため、記入しない。

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。

Report

(2 results)
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (4 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Direct Interfacial Excitation from TiO2 to Cu(II) Nanoclusters Enables Cathodic Photoresponse for Hydrogen Evolution under Visible‐Light Irradiation2023

    • Author(s)
      Wardhana Aufandra C.、Yamaguchi Akira、Adachi Kiyohiro、Hashizume Daisuke、Miyauchi Masahiro
    • Journal Title

      Small

      Volume: 2206893 Issue: 20 Pages: 1-7

    • DOI

      10.1002/smll.202206893

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct imaging of visible-light-induced one-step charge separation at the chromium oxide/strontium titanate interface2022

    • Author(s)
      Wardhana Aufandra Cakra、Yasuhara Sou、Yu Min-Wen、Yamaguchi Akira、Nagao Tadaaki、Ishii Satoshi、Miyauchi Masahiro
    • Journal Title

      Journal of Materials Chemistry A

      Volume: 10 Issue: 2 Pages: 752-761

    • DOI

      10.1039/d1ta08950a

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Elucidation of Interfacial Charge Excitation in Visible-light-active Cr2O3/SrTiO3 Photocatalyst System2021

    • Author(s)
      Aufandra Cakra Wardhana
    • Organizer
      ECSJ Fall Meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] Direct Observation of Interfacial Charge Excitation in Visible-light-active Cr2O3/SrTiO3 Photocatalytic System2021

    • Author(s)
      Aufandra Cakra Wardhana
    • Organizer
      STAC12
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2021-05-27   Modified: 2024-03-26  

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