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Development of ambient-pressure ultrasoft x-ray surface XAFS and application to operando observation of catalytic reactions under ambient pressure conditions

Research Project

Project/Area Number 18K19064
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
Research InstitutionKeio University

Principal Investigator

Kondoh Hiroshi  慶應義塾大学, 理工学部(矢上), 教授 (80302800)

Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
KeywordsX線吸収微細構造 / 極端軟X線 / 大気圧 / 触媒・化学プロセス / 表面・界面物性 / 量子ビーム / 化学物理
Outline of Final Research Achievements

Although the ultrasoft x-ray surface XAFS is a useful technique which enables us to obtain information on local geometric and electronic structures of surface species composed of light elements such as carbon, nitrogen and oxygen and the 4th-period metals such as titanium and iron, it has been assumed to be difficult to use this technique under atmospheric conditions.In this study, we aimed to be able to measure ultrasoft x-ray surface XAFS spectra under ambient-pressure conditions based on the conversion electron yield method and successfully developed an apparatus with which we can easily conduct ambient-pressure ultrasoft x-ray surface XAFS measurements.Furthermore we applied this technique to in-situ measurements for several materials under ambient-pressure conditions.

Academic Significance and Societal Importance of the Research Achievements

これまで主に硬X線領域で用いられてきた転換電子収量法を軽元素や第4周期元素の解析に有効な極端軟X線領域に導入し、適切な測定セルを用いることで大気圧下の表面XAFSを測定することが簡便にできるようになった。これにより、特にこれまで例が少なった軽元素からなる材料の大気圧下での表面敏感な測定が可能になるので、触媒や機能性材料の機能部位が軽元素で構成される物質表面である場合に、その作動条件下でのその場計測に有効に用いることができる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (4 results)

All 2021 2020 2018

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

  • [Journal Article] Chemical state changes of Nafion in model polymer electrolyte fuel cell under oxygen/hydrogen gas atmosphere observed by S-K XANES spectroscopy2018

    • Author(s)
      Kazuhisa Isegawa, Daehyun Kim, Hiroshi Kondoh
    • Journal Title

      RSC Advances

      Volume: 8 Issue: 67 Pages: 38204-38209

    • DOI

      10.1039/c8ra06426a

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 極端軟X線転換電子収量大気圧XAFS測定セルの開発2021

    • Author(s)
      清水啓史, 伊勢川和久, 市川理世, 豊島遼, 武安光太郎, 中村潤児, 間瀬一彦, 近藤寛
    • Organizer
      第34回日本放射光学会年会・放射光科学合同シンポジウム(JSR2021)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 大気圧極端軟X線転換電子収量XAFS測定システムの開発2021

    • Author(s)
      清水啓史, 伊勢川和久, 市川理世, 豊島遼, 武安光太郎, 中村潤児, 間瀬一彦, 近藤寛
    • Organizer
      2020年度量子ビームサイエンスフェスタ
    • Related Report
      2020 Annual Research Report
  • [Presentation] 軟X線転換電子収量大気圧表面XAFS測定セルの開発2020

    • Author(s)
      清水啓史, 伊勢川和久, 市川理世, 豊島遼, 武安光太郎, 中村潤児, 間瀬一彦, 近藤寛
    • Organizer
      2019年度量子ビームサイエンスフェスタ 第37回PFシンポジウム
    • Related Report
      2019 Research-status Report

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Published: 2018-07-25   Modified: 2022-01-27  

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