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2018 Fiscal Year Annual Research Report

Sensitizers Immobilized on Semiconducting Electrodes for Light Energy Conversion

Research Project

Project/Area Number 18H03898
Research InstitutionKyoto University

Principal Investigator

今堀 博  京都大学, 工学研究科, 教授 (90243261)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywords人工光合成 / 有機太陽電池 / ポルフィリン / 水酸化触媒 / 半導体電極
Outline of Annual Research Achievements

人工光合成は可視光を利用した物質変換を目指す研究であるが、現状では非常に低い性能にとどまっている。天然の光合成では、光捕集系で獲得されたエネルギーを用いて、反応中心タンパク質で一連の電子移動反応を行い、一方水酸化触媒から電子を奪うことで高活性な酸化種を生み出し、水からの電子引き抜き、酸素発生を可能にしている。本提案では上記の過程を人工的に模倣し、可視光物質変換機構を詳細に解明することで、人工光合成の高効率化を目指している。具体的には、可視光を捕集可能な酸化力の強い光増感分子を合成し、水酸化触媒分子と共に半導体電極上に固定化し、可視光応答型水分解セルを構築した。特に水酸化触媒分子において、触媒活性部位と半導体電極への固定化部位の間の距離を変化させることを試み、予備的ながらもその距離依存性を見出した。一方、上記の分子を用いた人工光合成は色素増感太陽電池と共通する点が多く、色素増感太陽電池の高効率化から得られる情報は人工光合成においても有用と思われる。いずれの系においても、太陽光の効率的な利用は高性能化に必須である。そこで色素増感太陽電池において、可視光・近赤外光の効率的な捕集が原理的に可能なポルフィリンに着目した。具体的には、新規な縮環構造を持つプッシュ・プル型のポルフィリン色素を分子設計・合成し、現在知られている最も性能の高い色素の一つであるGY50を上回る太陽電池性能を達成することができた。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

色素増感太陽電池においては、新規な分子設計で光増感色素を合成し、現在知られている最も性能の高い色素の一つであるGY50を上回る太陽電池性能を達成できたことは大きな進展である。一方、人工光合成に関しては、予備的ながらも可視光水分解の機構解明に取り組むための評価系構築の目処が立った段階である。

Strategy for Future Research Activity

色素増感太陽電池においては、今回得られた基礎的知見をフィードバックさせ、さらなる太陽電池性能向上を目指す。一方、人工光合成に関しては、触媒活性部位と半導体電極への固定化部位の間の距離を系統的に変化させ、可視光水分解活性との相関解明を試みる。

  • Research Products

    (22 results)

All 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (11 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 11 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results) Remarks (1 results)

  • [Int'l Joint Research] Tampere University of Technology(フィンランド)

    • Country Name
      FINLAND
    • Counterpart Institution
      Tampere University of Technology
  • [Int'l Joint Research] Tongji University(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      Tongji University
  • [Journal Article] Cleaner Synthesis and Systematical Chracterization of Sustainable Poly(isosorbide-co-ethylene terephthalate) by Environ-Benign and Highly Active Catalysts2019

    • Author(s)
      X.-G. Ki, G. Song, M.-R. Huang, T. Ohara, H. Yamada, T. Umeyama, T. Higashino, and H. Imahori
    • Journal Title

      J. Clean. Prod.

      Volume: 206 Pages: 483-497

    • DOI

      10.1016/j.jclepro.2018.09.046

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] ABC-ABC-Type meso-meso Directly Linked Porphyrin Dimers2019

    • Author(s)
      T. Higashino, Y. Kurumisawa, H. Iiyama, and H. Imahori
    • Journal Title

      Chem. Eur. J.

      Volume: 25 Pages: 538-547

    • DOI

      10.1002/chem.201805405

    • Peer Reviewed
  • [Journal Article] Synthesis of Phosphole-bridged Porphyrin Dimers2019

    • Author(s)
      T. Higashino, I. Nishimura, and H. Imahori
    • Journal Title

      Chem. Lett.

      Volume: 48 Pages: 257-259

    • DOI

      10.1246/cl.180943

    • Peer Reviewed
  • [Journal Article] cis-1 Isomers of Tethered Bismethano[70]fullerene as Electron Acceptors in Organic Photovoltaics2018

    • Author(s)
      T. Umeyama, S. Takahara, S. Shibata, K. Igarashi, T. Higashino, K. Mishima, K. Yamashita, and H. Imahori
    • Journal Title

      RSC Adv.

      Volume: 8 Pages: 18316-18326

    • DOI

      10.1039/C8RA02896F

    • Peer Reviewed / Open Access
  • [Journal Article] Enhanced Donor-π-Acceptor Character of A Porphyrin Dye Incorporating Naphthobisthiadiazole for Efficient Near Infrared Light Absorption2018

    • Author(s)
      T. Higashino, Y. Kurumisawa, S. Nimura, H. Iiyama, and H. Imahori
    • Journal Title

      Eur. J. Org. Chem.

      Volume: 2018 Pages: 2537-2547

    • DOI

      10.1002/ejoc.201701736

    • Peer Reviewed
  • [Journal Article] Photophysical Properties of Porphyrin Dimer-Single-Walled Carbon Nanotube Linked Systems2018

    • Author(s)
      J. Baek, T. Umeyama, S. Mizuno, N. V. Tkachenko, and H. Imahori
    • Journal Title

      J. Phys. Chem. C

      Volume: 122 Pages: 13285-13293

    • DOI

      10.1021/acs.jpcc.7b08594

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Unique Tube-Ring Interactions: Complexation of Single-Walled Carbon Nanotubes with Cycloparaphenyleneacetylenes2018

    • Author(s)
      K. Miki, K. Saiki, T. Umeyama, J. Baek, T. Noda, H. Imahori, Y. Sato, K. Suenaga, and K. Ohe
    • Journal Title

      Small

      Volume: 14 Pages: 1800720-1-9

    • DOI

      10.1002/smll.201800720

    • Peer Reviewed
  • [Journal Article] Calix[5]phyrin for Fluoride Ion Sensing with Visibel and Near Infrared Optical Responses2018

    • Author(s)
      T. Higashino, A. Kumagai, and H. Imahori
    • Journal Title

      Chem. Asian J.

      Volume: 13 Pages: 2019-2022

    • DOI

      10.1002/asia.201800856

    • Peer Reviewed
  • [Journal Article] Reversible π-System Switching of Thiophene-fused Thiahexaphyrins by Solvent and Oxidation/Reduction2018

    • Author(s)
      T. Higashino, A. Kumagai, S. Sakaki, and H. Imahori
    • Journal Title

      Chem. Sci.

      Volume: 9 Pages: 7528-7539

    • DOI

      10.1039/C8SC02448K

    • Peer Reviewed / Open Access
  • [Journal Article] Effect of Silicon Surface for Perovskite/Silicon Tandem Solar Cells: Flat or Textured?2018

    • Author(s)
      H. Kanda, N. Shibayama, A. Uzum, T. Umeyama, H. Imahori, K. Ibi, and S. Ito
    • Journal Title

      ACS Appl. Mater. Interfaces

      Volume: 10 Pages: 35016-35024

    • DOI

      10.1021/acsami.8b08701

    • Peer Reviewed
  • [Journal Article] Electron Transfer and Exciplex Chemistry of Functionalized Nanocarbons: Effects of Electronic Coupling and Donor Dimerization2018

    • Author(s)
      T. Umeyama and H. Imahori
    • Journal Title

      Nanoscale Horiz.

      Volume: 3 Pages: 352-366

    • DOI

      10.1039/C8NH00024G

    • Peer Reviewed / Open Access
  • [Presentation] Molecular Engineering of Organic Photovoltaics and Solar Fuels2019

    • Author(s)
      H. Imahori
    • Organizer
      28th Inter-American Photochemcial Society (I-APS) Winter Meeting
    • Int'l Joint Research / Invited
  • [Presentation] Visible Light-Driven Watern Oxidtion with Porphyrin Sensitizers and Water Oxidtion Catalysts2018

    • Author(s)
      H. Imahori
    • Organizer
      233rd Meeting of The Electrochemical Society
    • Int'l Joint Research / Invited
  • [Presentation] Exciplex Formation and Decay in Porphyrin-Carbon Nanotube Ensembles2018

    • Author(s)
      H. Imahori
    • Organizer
      233rd Meeting of The Electrochemical Society
    • Int'l Joint Research / Invited
  • [Presentation] Porphyrins as Excellent Sensitizers for Energy and Biological Applications2018

    • Author(s)
      H. Imahori
    • Organizer
      International Conference on Porphyrins and Phthalocyanines (ICPP-10)
    • Int'l Joint Research / Invited
  • [Presentation] Mimicking Photosynthesis for Photoinduced Charge Separation and Solar Energy Conversion2018

    • Author(s)
      H. Imahori
    • Organizer
      The 22nd International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-22)
    • Int'l Joint Research / Invited
  • [Presentation] Molecular Engineering for Bulk Heterojunction and Dye-Sensitized Organic Solar Cells2018

    • Author(s)
      H. Imahori
    • Organizer
      International Conference on Energy and Environmental Materials (ICEEM 2018)
    • Int'l Joint Research / Invited
  • [Presentation] Porphyrins for Photoinduced Charge Separation and Solar Energy Conversion2018

    • Author(s)
      H. Imahori
    • Organizer
      Asian Workshop on Frontiers of Porphyrins and Phthalocyanines
    • Int'l Joint Research / Invited
  • [Presentation] Molecular Engineering for Photoinduced Charge Separation and Solar Energy Conversion2018

    • Author(s)
      H. Imahori
    • Organizer
      10th Asian Photochemistry Conference
    • Int'l Joint Research / Invited
  • [Remarks] 最近の論文から

    • URL

      http://www.moleng.kyoto-u.ac.jp/~moleng_05/research_paper.html

URL: 

Published: 2019-12-27  

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