• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Innovative and efficient materials conversion by bio-inorganic photocatalyst

Research Project

Project/Area Number 21K18213
Research Category

Grant-in-Aid for Challenging Research (Pioneering)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
Research InstitutionKyushu University

Principal Investigator

Ishihara Tatsumi  九州大学, 工学研究院, 教授 (80184555)

Co-Investigator(Kenkyū-buntansha) Song Juntae  九州大学, 工学研究院, 助教 (10865348)
Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2023: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2022: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2021: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Keywords光触媒 / バイオ触媒 / 物質変換 / アンモニア合成
Outline of Research at the Start

太陽光は、無限といってよいエネルギーで、効率よく、水素や有用な化合物へ直接変換できる触媒プロセスは、永続的な人類の発展という観点で、重要である。本研究では直接光エネルギーを化学エネルギーに変換可能という観点から、光触媒に着目し、新しいバイオ光触媒というコンセプトの創出を行う。本研究では、従来の無機光触媒ではバイオ触媒との複合は、バイオ触媒の寿命の観点から不可能と考えられてきた常識に挑戦し、酸化還元対で電荷を伝達することで、酵素を光触媒と組み合わせて、従来は進まないと考えられている多電子系の反応を行うことのできる新規なバイオ光触媒という概念を創出し、新しい学術領域に挑戦する。

Outline of Final Research Achievements

This research was mainly studied on 1) increasing the efficiency of inorganic photocatalysts, 2) developing new biophotocatalytic reactions, and 3) developing photoelectrochemical cells. As for subject 1), Eosin Y showed a good sensitizing effect, and the AQY for visible light at 520 nm was as high as 1.5%. In combination with hydrogenase, STH for hydrogen formation in the presence of a sacrificial agent was as high as 2.5%. As for subject 2), ammonia synthesis using nitrogenase was studied as a new reaction, and it was possible to synthesize large quantities of nitrogenase by modifying the culture medium, and formation of NH3 and H2 was successfully demonstrated. As for subject 3), electrochemical cell using TiO2 as the positive electrode was studied, and reduction of MV and oxygen formation were achieved by applying a voltage of about 0.1 V under light irradiation.

Academic Significance and Societal Importance of the Research Achievements

現在、カーボンニュートラルエネルギー社会の達成が強く求められている。本研究では光エネルギーを直接、水素として固定するために、効率の高い光触媒として、バイオ触媒と無機触媒を組み合わせるというコンセプトで、通常は、平衡の制約がある反応で、平衡を超えて、大きな効率で水素やアンモニアを合成できることを示した。とくにアンモニアは現在、肥料として必要不可欠であり、エネルギー消費の大きいハーバーボッシュ法で作成されているが、今回、室温、常圧で、気相N2と水からNH3と水素が合成できる可能性を示すことができたので、今後は、さらに生成速度を向上することで、環境調和なアンモニア合成プロセスになる可能性がある。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Comments on the Screening Results   Research-status Report
  • Research Products

    (5 results)

All 2024 2023 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Photobiocatalytic conversion of solar energy to NH3 from N2 and H2O under ambient condition2024

    • Author(s)
      Kosem Nuttavut、Shen Xiao-feng、Ohsaki Yutaka、Watanabe Motonori、Song Jun Tae、Ishihara Tatsumi
    • Journal Title

      Applied Catalysis B: Environmental

      Volume: 342 Pages: 123431-123431

    • DOI

      10.1016/j.apcatb.2023.123431

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A comprehensive study on rational biocatalysts and individual components of photobiocatalytic H2 production systems2023

    • Author(s)
      Kosem Nuttavut、Watanabe Motonori、Song Jun Tae、Takagaki Atsushi、Ishihara Tatsumi
    • Journal Title

      Applied Catalysis A: General

      Volume: 651 Pages: 119019-119019

    • DOI

      10.1016/j.apcata.2022.119019

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 無機 /whole-cell バイオハイブリッド光触媒におけるCO2の効果2023

    • Author(s)
      大﨑穣, KOSEM, Nuttavut, SONG, Jun Tae, 渡邊源規, 石原達己
    • Organizer
      第132回触媒討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Novel effect of CO2 in inorganic / whole-cell bio hybrid photocatalyst system2023

    • Author(s)
      Yutaka Ohsaki
    • Organizer
      The Sino-Japan Symposium on Environmental Catalysis (SSEC) 2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Enhancement of photobiocatalytic H2 production using different sacrificial agents and redox mediators.2021

    • Author(s)
      Nuttavut Kosem, Watanabe Motonori, Ishihara Tatsumi
    • Organizer
      第128回触媒討論会
    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi