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Molecular-Based Photoelectrochemical Cell Consisting of Two TiO2 electrodes for Overall Solar Water Splitting Under Bias-Free Conditions

Research Project

Project/Area Number 19K05502
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 34010:Inorganic/coordination chemistry-related
Research InstitutionKyushu University

Principal Investigator

Ozawa Hironobu  九州大学, 理学研究院, 准教授 (30572804)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords太陽光水分解 / 錯体触媒 / 錯体色素 / 光電気化学 / 二酸化チタン / TiO2 / 水分解 / 光電気化学セル
Outline of Research at the Start

本研究では、錯体色素および酸素生成錯体触媒を修飾したTiO2電極(フォトアノード)と、水素生成錯体触媒を修飾したTiO2電極(カソード)からなる、両極にTiO2を用いた分子性PECにおいて、外部バイアスを必要とせずにアノードからカソードへ高エネルギー電子が移動し、且つカソード上において水素生成反応が進行することを初めて見出した。本研究では、アノード上における光酸素生成反応に着目し、この反応の効率を支配している因子を明らかにすることによって、両極にTiO2を用いた分子性PECにおいてノンバイアスでの太陽光水分解の達成を目指して研究を行う。

Outline of Final Research Achievements

In order to develop the molecular-based photoelectrochemical cells promoting overall water splitting even under bias-free conditions, the backward electron transfer from the conduction band of TiO2 to the water oxidation catalyst should be suppressed effectively. In this study, several water oxidation catalysts having spacer units have been synthesized, and the TiO2 electrodes modified with these water oxidation catalysts have been also fabricated for this purpose. Moreover, a dinuclear complex having both the photosensitizing and the catalytic units has been synthesized, and the TiO2 electrode modified with this dinuclear complex has been also prepared. Several valuable insights into the development of the molecular-based photoelectrochemical cells for overall water splitting have been obtained in this study.

Academic Significance and Societal Importance of the Research Achievements

本研究では、光増感サイトと触媒反応サイトを単一分子化した二核錯体の合成、およびこれを修飾したTiO2電極の作製を行い、この修飾電極が電気化学的な酸素生成触媒機能を示すことを明らかにした。TiO2電極表面における光増感サイトと触媒反応サイトでの電子移動や、
酸素生成触媒反応に関して非常に有用な知見を得ることができ、各種光エネルギー変換反応に関する研究の飛躍的な進展につながると期待される。また、各種光エネルギー変換反応に関する研究が飛躍的に進展することによって、持続可能な社会の早期実現に向けて大きく貢献できると考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (14 results)

All 2021 2020 2019 Other

All Journal Article (3 results) (of which Open Access: 1 results,  Peer Reviewed: 2 results) Presentation (8 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results) Book (2 results) Remarks (1 results)

  • [Journal Article] Two-Electrode Solar Water Splitting Permitting H2 Separation at a Dark Cathode2021

    • Author(s)
      Hironobu Ozawa, Ken Sakai
    • Journal Title

      AsiaChem

      Volume: 2 Issue: 1 Pages: 80-87

    • DOI

      10.51167/acm00027

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Improving the overall performance of photochemical H2 evolution catalyzed by the Co-NHC complex via the redox tuning of electron relays2021

    • Author(s)
      Yatsuzuka Koichi、Yamauchi Kosei、Kawano Ken、Ozawa Hironobu、Sakai Ken
    • Journal Title

      Sustainable Energy & Fuels

      Volume: 5 Issue: 3 Pages: 740-749

    • DOI

      10.1039/d0se01597k

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Molecular-Based Water Electrolyzer Consisting of Two Mesoporous TiO2 Electrodes Modified with Metalloporphyrin Molecular Catalysts Showing a Quantitative Faradaic Efficiency2020

    • Author(s)
      Akamine Katsuhiro、Morita Kohei、Sakai Ken、Ozawa Hironobu
    • Journal Title

      ACS Applied Energy Materials

      Volume: 3 Issue: 5 Pages: 4860-4866

    • DOI

      10.1021/acsaem.0c00443

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 金属ポルフィリンを修飾したTiO2電極の作製とそれを用いたCO2還元触媒反応2021

    • Author(s)
      菊永竜馬、酒井 健、小澤弘宜
    • Organizer
      錯体化学会 第71回討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] TiO2 Electrodes Modified with Molecular Photosensitizer and Catalyst for Photoelectrochemical Water Oxidation2021

    • Author(s)
      Xin YAN, Ken SAKAI, Hironobu OZAWA
    • Organizer
      錯体化学会 第71回討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Photocatalytic CO2 Reduction in Water by Mesoporous Graphitic Carbon Nitride Modified with Cobalt Porphyrin Molecular Catalyst2021

    • Author(s)
      Conghao JI, Xian ZHANG, Hironobu OZAWA, Ken SAKAI
    • Organizer
      錯体化学会 第71回討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Molecular-Based Photoelectrochemical Cells for Overall Water Splitting Consisting of Two TiO2 Electrodes2020

    • Author(s)
      Hironobu Ozawa
    • Organizer
      International Symposium between ETH Zurich and Kyushu University New Trends in Photophysics and Photochemistry and Their Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 錯体触媒を修飾したTiO2電極を用いた電気化学的な水の完全分解2020

    • Author(s)
      小澤 弘宜
    • Organizer
      九州錯体化学懇談会 第259回例会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two TiO2 electrodes2019

    • Author(s)
      Hironobu Ozawa
    • Organizer
      International Conference on Photocatalysis and Photoenergy 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two TiO2 electrodes2019

    • Author(s)
      Hironobu Ozawa
    • Organizer
      The 23rd International Symposium on the Photochemistry and Photophysics of Coordination Compounds
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Molecular-Based Electrochemical Cell for Overall Water Splitting Consisting of Two TiO2 Electrodes2019

    • Author(s)
      Hironobu Ozawa
    • Organizer
      International Conference on Artificial Photosynthesis-2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Book] 光エネルギー変換における分子触媒の新展開 第9章 分子性色素増感光電気化学セルによる太陽光水分解2020

    • Author(s)
      森田浩平、酒井 健、小澤弘宜
    • Total Pages
      9
    • Publisher
      化学同人
    • ISBN
      9784759813982
    • Related Report
      2020 Research-status Report
  • [Book] エネルギー・資源 特集 人口光合成研究の最前線(5) 分子性錯体触媒を修飾したTiO2電極による水の完全分解2020

    • Author(s)
      小澤弘宜、酒井 健、
    • Total Pages
      6
    • Publisher
      エネルギー・資源学会
    • Related Report
      2020 Research-status Report
  • [Remarks] 九州大学大学院理学研究院化学部門 錯体化学研究室

    • URL

      http://www.scc.kyushu-u.ac.jp/Sakutai/jp/index.html

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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