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Development of a novel photocatalytic reaction system using photocatalytically accumulated electrons

Research Project

Project/Area Number 20K05666
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research InstitutionKyushu Institute of Technology

Principal Investigator

Murakami Naoya  九州工業大学, 大学院生命体工学研究科, 教授 (10452822)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords光触媒 / トラップ電子 / 光音響
Outline of Research at the Start

半導体光触媒中の欠陥サイトに電子が捕捉された状態であるトラップ電子は,反応に寄与しないという認識が強かったが,我々は二酸化チタン光触媒粒子中のトラップ電子の解析を行っていくなかで,比較的多くのトラップ電子が還元反応に利用可能であることを見出した.本研究では,光触媒粒子中に存在するトラップ電子の反応機構を明らかにするとともに,これらを有効活用することによって,新たな光触媒反応系の構築に取り組む.目的を達成するために,懸濁系反応場におけるトラップ電子のエネルギー状態を解析可能な光音響分光分析を確立するとともに電子蓄積・放出反応からなる2段階の反応を行い,従来反応に対するアドバンテージを示す.

Outline of Final Research Achievements

In the present study, the energy level and the reactivity of accumulated electrons under a liquid-phase photocatalytic condition were studied by infrared photoacoustic spectroscopy. The results indicate that the reduction proceed by accumulated electrons at defective sites as well as conduction band electrons reexcited from trapped energy levels, and it strongly depends on kinds of the acceptor. Moreover, reduction of several acceptors (nitrobenzene, nitrate, carbon dioxide, proton) was performed by a time-separated redox reaction using photocatalytically accumulated electrons in a titanium(IV) oxide (TiO2) suspension. The time-separated redox reaction uses a two-step reaction under the control of photoexcitation and an electron acceptor: (1) accumulation of electrons in TiO2 powder under photoexcitation and (2) reduction of added acceptors by accumulated electrons in the dark.

Academic Significance and Societal Importance of the Research Achievements

本研究を遂行するために開発された分析系は,光触媒をはじめとする半導体材料の解析手法として有効であり,水分解による水素製造や二酸化炭素の資源化を可能にするようなエネルギー変換型の光触媒材料などの設計にも役立つと考えられる.また,本研究で構築した反応系は,これまで反応に寄与することはないと考えられていたトラップ電子を活用し,電子蓄積反応と電子放出反応の2段階の反応を行うことにより,酸化と還元の時間的な分離を行ったものである.これは,光触媒反応で問題となっている逆反応を根本的に解決する方法として有効であり,高選択的な光―物質返還へ応用できる可能性がある.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (19 results)

All 2023 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results) Presentation (11 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Photoacoustic Infrared Analysis of the Reactivity of Electrons Accumulated in Titanium(IV) Oxide Particles Under a Liquid-phase Photocatalytic Condition2023

    • Author(s)
      Tatsuki Shinoda, Naoya Murakami
    • Journal Title

      Chemistry Letters

      Volume: 52 Issue: 1 Pages: 13-16

    • DOI

      10.1246/cl.220442

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Photoacoustic Spectroscopic Analysis of Electron-Trapping Sites in Titanium(IV) Oxide Photocatalyst Powder Treated by Ball Milling2022

    • Author(s)
      Tatsuki Shinoda, Yuichi Yamaguchi, Akihiko Kudo, Naoya Murakami
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 126 Issue: 49 Pages: 20975-20982

    • DOI

      10.1021/acs.jpcc.2c07064

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reduction of nitrate to ammonia using photocatalytically accumulated electrons on titanium(IV) oxide in a time-separated redox reaction2022

    • Author(s)
      Murakami Naoya、Suenaga Masato、Deguchi Ryota
    • Journal Title

      Inorganic Chemistry Communications

      Volume: 141 Pages: 109585-109585

    • DOI

      10.1016/j.inoche.2022.109585

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fe(III)-Pt(II) oxide-co-sensitized brookite TiO2 nanorods for photocatalytic degradation of acetaldehyde under visible light2022

    • Author(s)
      Cao Yu、Lou Shi Nee、Wang Sicong、Yang Hui、Zhang Qitao、Wang Chengyin、Murakami Naoya、Ohno Teruhisa
    • Journal Title

      Applied Catalysis A: General

      Volume: 634 Pages: 118539-118539

    • DOI

      10.1016/j.apcata.2022.118539

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Accumulation Process of Photogenerated Electrons in Titanium(IV) Oxide Photocatalyst Particles: Photoacoustic Infrared Spectroscopy Study2022

    • Author(s)
      Shinoda Tatsuki、Murakami Naoya
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 126 Issue: 10 Pages: 4889-4898

    • DOI

      10.1021/acs.jpcc.2c00603

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] In situ photoacoustic analysis of near-infrared absorption of rhodium-doped strontium titanate photocatalyst powder2020

    • Author(s)
      Shinoda Tatsuki、Yamaguchi Yuichi、Kudo Akihiko、Murakami Naoya
    • Journal Title

      Chemical Communications

      Volume: 56 Issue: 91 Pages: 14255-14258

    • DOI

      10.1039/d0cc06414a

    • NAID

      120007166952

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Simultaneous Measurements of Photoabsorption and Photoelectrochemical Performance for Thickness Optimization of a Semiconductor Photoelectrode2020

    • Author(s)
      Murakami Naoya、Watanabe Ryo
    • Journal Title

      ACS Combinatorial Science

      Volume: 22 Issue: 12 Pages: 791-795

    • DOI

      10.1021/acscombsci.0c00113

    • NAID

      120007166970

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of Plasmonic Photocatalyst by Site‐selective Loading of Bimetallic Nanoparticles of Au and Ag on Titanium(IV) Oxide2020

    • Author(s)
      Zheng Zhi、Murakami Naoya、Liu Jingjing、Teng Zhenyuan、Zhang Qitao、Cao Yu、Cheng Honghui、Ohno Teruhisa
    • Journal Title

      ChemCatChem

      Volume: 12 Issue: 14 Pages: 3783-3792

    • DOI

      10.1002/cctc.202000366

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 二酸化チタン光触媒を用いた二層反応系での芳香族化合物の水素化2022

    • Author(s)
      末永 真里,村上 直也
    • Organizer
      第130回触媒討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 液相系光触媒反応場における酸化チタン(IV)中の電子蓄積・放出挙動の光音響解析2022

    • Author(s)
      篠田 樹,村上 直也
    • Organizer
      第130回触媒討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Photoacoustic infrared spectroscopic analysis of energy levels and accumulation process of trapped electrons in titanium (IV) oxide photocatalyst particles2022

    • Author(s)
      Tatsuki SHINODA, Naoya MURAKAMI
    • Organizer
      The 9th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT9)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Photocatalytic hydrogenation of nitrobenzene to aniline in two-phase reaction system using titanium (IV) oxide particles2022

    • Author(s)
      Masato SUENAGA, Naoya MURAKAMI
    • Organizer
      The 9th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT9)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 二酸化チタン光触媒反応を用いた二層溶媒中でのニトロベンゼン水素化2022

    • Author(s)
      末永真里,村上直也
    • Organizer
      第59回化学関連支部合同九州大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 二酸化チタン中の蓄積電子を利用した二酸化炭素の選択的還元反応2022

    • Author(s)
      重久花乃子,村上直也
    • Organizer
      第59回化学関連支部合同九州大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 光音響効果を用いた気相水分解反応の内部量子効率測定2022

    • Author(s)
      藤田壮陽,村上直也
    • Organizer
      第59回化学関連支部合同九州大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 光音響測定にもとづく酸化チタン(IV)光触媒におけるトラップ電子の生成過程の解明2021

    • Author(s)
      篠田樹, 村上直也
    • Organizer
      第58回化学関連支部合同九州大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 二酸化チタン中の蓄積電子を用いたアンモニア生成2021

    • Author(s)
      末永真里, 村上直也
    • Organizer
      第58回化学関連支部合同九州大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 光音響分光法を用いた酸化チタン粒子中の欠陥準位の検出と電子蓄積過程の観察2021

    • Author(s)
      電気化学会第88回大会
    • Organizer
      篠田 樹、村上 直也
    • Related Report
      2020 Research-status Report
  • [Presentation] 赤外光音響分光法による粉末光触媒の電子トラップ準位の評価2021

    • Author(s)
      第127回触媒討論会
    • Organizer
      篠田 樹、村上 直也
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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