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Study of reaction mechanism based on evaluation of electron transfer under photocatalytic reaction

Research Project

Project/Area Number 21K14722
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionOsaka Metropolitan University (2022-2023)
Osaka City University (2021)

Principal Investigator

Yamamoto Muneaki  大阪公立大学, 人工光合成研究センター, 特任助教 (50823712)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords二酸化炭素還元 / in-situ分析 / 光触媒 / CO2還元 / オペランド / 反応メカニズム
Outline of Research at the Start

持続可能な社会の実現に向けて、再生可能エネルギーである太陽光を利用し、CO2を還元・再資源化することのできる光触媒の開発が望まれている。本研究では、反応条件下でUV-Vis・XAFS・FT-IR測定をすることで、助触媒の化学状態変化と光触媒表面のCO2の吸着状態変化とを対応させ、反応メカニズムを明らかにする。このようなオペランド測定により、CO2の光触媒的還元反応における助触媒の機能解明を目指す。

Outline of Final Research Achievements

In this study, in-situ analysis of gallium oxide photocatalysts with silver nanoparticles as a co-catalyst was carried out in the presence of carbon dioxide and water vapor in order to construct a photocatalytic system to obtain useful carbon compounds.
The band gap excitation of the gallium oxide photocatalyst reduced the silver nanoparticles, whereas the localized surface plasmon resonance of the silver nanoparticles partially oxidized the surface of silver nanoparticles and the amount of adsorbed bicarbonate species as a reaction intermediate increased.
These results indicate that carbon dioxide reduction can be efficiently promoted by irradiating light at two different wavelengths.

Academic Significance and Societal Importance of the Research Achievements

本研究は,持続可能な社会を構築するために,年々増加する二酸化炭素を炭素資源に変換する研究である.実用化に向けては,更なる反応活性の向上が必要であるが,そのためには反応のメカニズムを理解することが重要である.本研究で得られた,役割の異なる2種の波長の光照射により二酸化炭素変換反応を効率的に進行させることができるという知見は,本反応の効率化のみならず,他の反応系への応用も期待される.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2023 2022 2021

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

  • [Journal Article] 酸化ガリウム光触媒上に担持された銀ナノ粒子のin-situ UV-Vis拡散反射およびXAFS測定2023

    • Author(s)
      山本宗昭,北島乃樹,田辺哲朗,吉田朋子
    • Journal Title

      X線分析の進歩

      Volume: 54 Pages: 165-172

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Real time measurements of UV-vis diffuse reflectance of silver nanoparticles on gallium oxide photocatalyst2021

    • Author(s)
      Kitajima Daiki、Yamamoto Muneaki、Tanabe Tetsuo、Yoshida Tomoko
    • Journal Title

      Catalysis Today

      Volume: 375 Pages: 501-505

    • DOI

      10.1016/j.cattod.2020.04.063

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2019704

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] The role of Ag-NPs loaded on Ga2O3 on the photocatalytic CO2 reduction studied by in situ spectroscopies2022

    • Author(s)
      Muneaki Yamamoto, Tomoka Yamamoto, Tetsuo Tanabe, Tomoko Yoshida
    • Organizer
      14th International Symposium on Atomic Level Characterizations for New Materials and Devices '22
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 光照射波長による銀ナノ粒子の化学状態変化と二酸化炭素還元反応への影響2022

    • Author(s)
      山本宗昭,北嶋乃樹,吉岡こころ,田辺哲朗,吉田朋子
    • Organizer
      第129回触媒討論会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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