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

The behavior of residual hydrogen behavior and visualization of diffusion pathways in hydrogen storage materials by in situ neutron scattering

Research Project

Project/Area Number 21K12534
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionIbaraki University

Principal Investigator

Iwase Kenji  茨城大学, 理工学研究科(工学野), 准教授 (00524159)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords中性子回折 / Rietveld解析 / 水素貯蔵材料 / 拡散 / 重水素化物 / PDF解析 / 量子ビーム
Outline of Research at the Start

本研究では、大強度陽子加速器施設内の中性子回折装置とその場観察測定(In-situ測定)を活用し、Ti-Cr-Mo固溶体合金の吸蔵放出特性をフルに引き出すために“残留水素が占有するサイト及び占有サイトを形成している金属原子(Ti,Cr,Mo)の分布”を突き止めることを目的とする。

Outline of Final Research Achievements

TiCrMo bcc solid solution alloy is unable to release all of the hydrogen absorbed in the first cycle, and some remains in the alloy. The amount of hydrogen remaining reaches about 40% of the maximum hydrogen capacity. Neutron diffraction experiments were performed during the absorption-desorption process. The structural change from the bcc structure to the CaF2-type structure with hydrogen absorption, and the occupation and amount of hydrogen remaining in the alloy during the structural change and in the alloy could be quantified. In the case of maximum hydrogen absorption, the CaF2-type structure is present and hydrogen occupies only the T site. In the case of residual hydrogen, the bcc structure is present and hydrogen occupies the T site. The distribution of metal atoms around the residual hydrogen was analyzed, and it was found that Ti was more abundantly distributed than Cr and Mo.

Academic Significance and Societal Importance of the Research Achievements

金属格子内のTiの配置を制御することが、残留水素の解消に繋がる。残留水素が占有されているTサイトを構成するTi,Cr,Moが均一に配置されることによって、残留水素量の減少が可能となると思われる。これまでアーク溶解を用いて、固溶体合金の合成を実施してきた。今回の研究成果から、アーク溶解以外の手法でTi,Cr,Moの配置を制御する合成方法を導入することによって、吸蔵放出特性の改善が可能となる。残留水素の解消によって、これまでの水素貯蔵材料の中で、繰り返し最大量の吸蔵放出が可能となることが期待される。この結果は、社会での水素インフラの普及過程において、水素貯蔵材料の活用に岐路を見出せたと考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] Crystal and local structures of La2Co7Hx obtained by synchrotron X-ray total scattering2023

    • Author(s)
      Kenji Iwase, Takashi Ueno, Seiya Mashii, Hyunjeong Kim, Kouji Sakaki, Kazuhiro Mori
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 946 Pages: 169380-169380

    • DOI

      10.1016/j.jallcom.2023.169380

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal structure of deuteride phase of Nd-Ni alloy by X-ray and neutron diffraction2022

    • Author(s)
      Kenji Iwase, Shuhei Ishida, Takashi Ueno, Kazuhiro Mori
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 924 Pages: 166557-166557

    • DOI

      10.1016/j.jallcom.2022.166557

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Phase transformation of hydride-phase Nd2Co7 with superlattice structure2022

    • Author(s)
      Kenji Iwase, Yugo Honjyo, Kazuhiro Mori
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 316 Pages: 123575-123575

    • DOI

      10.1016/j.jssc.2022.123575

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Mn置換が水素吸蔵放出特性に与える影響及びYNi3-xMnxの結晶構造2023

    • Author(s)
      國本怜遠, 山崎陸渡, 岩瀬謙二
    • Organizer
      日本金属学会春期講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] サイクル回数に伴うYCo3の水素吸蔵放出特性及び結晶構造の変化2021

    • Author(s)
      木村大河、岩瀬謙二
    • Organizer
      日本金属学会秋季講演大会
    • Related Report
      2021 Research-status Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi