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Analysis of chemical composition of water molecules inside anion exchange membrane fuel cell membrane during power generation and synthesis of new electrolyte membrane

Research Project

Project/Area Number 21H02044
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionUniversity of Yamanashi

Principal Investigator

Inukai Junji  山梨大学, 大学院総合研究部, 教授 (70245611)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2022: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2021: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Keywordsアニオン型イオン交換膜 / 燃料電池 / 水分子 / ラマン分光法 / 非線形ラマン分光法 / AEMFC / CARS / 水の定量 / 水の同定 / AEM / 振動分光 / Raman / 発電 / 時間・空間分布
Outline of Research at the Start

アニオン交換膜(AEM)内部に存在する異なった水素結合をもつそれぞれの水分子を、申請者が開発した顕微光学系を備えたコヒーレントアンチストークスラマン散乱(CARS)分光装置(深さ分解能 1 um、時間分解能 0.5 s)を用いて解析する。
1年目は、装置改良後、AEMFC定常発電中のAEMおよび水の分子振動をCARS分光によって測定する。
2年目は、電流密度ジャンプ法などによるAEM内部の水分子ダイナミクスを、高時間分解能で解析する。
3年目は、系統的に合成されたAEMの詳細な解析により発電中のアニオン導電性向上のメカニズムを探り、発電状態で高アニオン導電性を有する新規AEMを合成する。

Outline of Final Research Achievements

In the first year, the molecular vibrations of AEM and water during AEMFC steady power generation were measured using CARS spectroscopy. Together with the results of synchrotron radiation X-ray scattering, neutron elastic scattering, and quantum chemical calculations, the water molecules inside the AEM were identified and quantified. The distribution of liquid water inside the AEMFC during steady power generation was further analyzed by neutron beam imaging, together with the distribution of water molecules inside the AEM, which was obtained by CARS spectroscopy. In the second year, we analyzed the water molecule dynamics inside the AEM using current density jump methods and other techniques with high temporal resolution. In the third year, we investigated the mechanism of improved anionic conductivity during power generation through detailed analysis of systematically synthesized AEMs, leading to the synthesis of a new AEM with high anionic conductivity during power generation.

Academic Significance and Societal Importance of the Research Achievements

貴金属を触媒として利用せずとも作動するため、アニオン型イオン交換膜を用いて燃料電池や水電解装置の社会実装が期待されている。アニオン型イオン交換膜のイオン導電性や燃料電池や水電解装置に利用した時の劣化は、電解質内部に存在する水分子の状態に大きく依存することがわかっている。その一方で、アニオン型イオン交換膜内部にどのような種類の水分子がどのように分布しているかの知見は全くなかった。
本研究では、発電中燃料電池内部のアニオン型イオン交換膜内部の水の種類とその分布を、振動分光を用いて世界で初めて明らかにした。本研究は、あらたなアニオン型イオン交換膜の合成とその利用に、大きな寄与をするものである。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021

All Journal Article (5 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy2024

    • Author(s)
      S. W. Wakolo, K. Miyatake, and J. Inukai
    • Journal Title

      Electrochemistry

      Volume: 92 Issue: 1 Pages: 017005-017005

    • DOI

      10.5796/electrochemistry.23-00140

    • ISSN
      1344-3542, 2186-2451
    • Year and Date
      2024-01-31
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Coherent anti-Stokes Raman scattering spectroscopy system for observation of water molecules in anion exchange membrane2024

    • Author(s)
      Wakolo Solomon Wekesa、Syouji Atsushi、Sakai Masaru、Nishiyama Hiromichi、Inukai Junji
    • Journal Title

      Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

      Volume: 309 Pages: 123875-123875

    • DOI

      10.1016/j.saa.2024.123875

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Operando Monitoring of Oxygen Drop in Catalyst Layers Accompanied by a Water Increase in Running Proton Exchange Membrane Fuel Cells2023

    • Author(s)
      H. Nishiyama and J. Inukai
    • Journal Title

      ACS Omega

      Volume: 8 Issue: 17 Pages: 15318-15322

    • DOI

      10.1021/acsomega.3c00461

    • Related Report
      2023 Annual Research Report
  • [Journal Article] In-situ observation of an anion exchange membrane at various humidity by X-ray scattering2023

    • Author(s)
      Yoshida Koji、Nagai Tetsuro、Ohara Koji、Shirase Yuto、Miyatake Kenji、Inukai Junji
    • Journal Title

      Journal of Molecular Liquids

      Volume: 391 Pages: 123197-123197

    • DOI

      10.1016/j.molliq.2023.123197

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The distribution and diffusion coefficient of water inside a Nafion membrane in a running fuel cell under transient conditions analyzed by operando time-resolved CARS spectroscopy2022

    • Author(s)
      H. Nishiyama, A. Iiyama, J. Inukai
    • Journal Title

      Journal of Power Sources Advances

      Volume: 13 Pages: 100080-100080

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 1.A Study on the Performance Stability and the Water Management of PEFC with Interdigitated Gas Flow Channels Formed on a Gas Diffusion Layer - Improvement of Performance Stability under High & Low Humidification Conditions and Clarification of the Mechanisms by Experimental and Numerical Analysis2023

    • Author(s)
      T. Inoue, D. Sakai, K. Hirota, K, Sano, N. Hirayama, M. Nasu, T. Suzuki, S. Tsushima, J. Inukai, M. Watanabe, A. Iiyama, and M. Uchida
    • Organizer
      EVTeC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Collaboration between University of Yamanashi and the University of Santo Tomas Through SATREPS Program2023

    • Author(s)
      Junji Inukai
    • Organizer
      Joint Symposium on Energy Materials 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Materials Needed for Proton Exchange Membrane Fuel Cells Operated at Temperatures Higher than 100 degree C2023

    • Author(s)
      Junji Inukai
    • Organizer
      ICFCHT-SFCHT 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of Dissolved Gases on Pt Nanoparticle Catalysts Investigated by in Situ SAXS, XAS Measurements2023

    • Author(s)
      T. Watanabe, T. Kawamoto, H. Nishiyama, Y. Hiraoka, M. Wakisaka, I. Hirosawa, and J. Inukai
    • Organizer
      244th ECS Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 8.Operando 3D-Monitoring of the Oxygen Partial Pressure (p(O2)) within a Polymer Electrolyte Membrane Fuel Cell (PEMFC) during Cell Operations at Higher Temperatures2023

    • Author(s)
      C. L. Schreiber and J. Inukai
    • Organizer
      244th ECS Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Operando time-resolved CARS spectroscopy measurement of the water distribution in PEM under transient conditions during fuel cell operation2021

    • Author(s)
      H. Nishiyama, A. Iiyama, J. Inukai
    • Organizer
      MRM2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Distribution of water and its chemical state inside the fuel cell electrolyte membranes under transient conditions during power generation analyzed by operando time-resolved CARS spectroscopy2021

    • Author(s)
      H. Nishiyama, A. Iiyama, J. Inukai
    • Organizer
      ISSS9
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Book] Proceedings of the 1st International Conference of New Energy2023

    • Author(s)
      K. Nagase and J. Inukai
    • Total Pages
      182
    • Publisher
      Springer
    • ISBN
      9789819908585
    • Related Report
      2023 Annual Research Report

URL: 

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

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