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Search and qualification of uranium alloys with high hydrogen storage capacity

Research Project

Project/Area Number 16K06955
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Nuclear engineering
Research InstitutionUniversity of Fukui

Principal Investigator

Yamamoto Takuya  福井大学, 附属国際原子力工学研究所, 客員教授 (50212296)

Co-Investigator(Kenkyū-buntansha) 有田 裕二  福井大学, 附属国際原子力工学研究所, 教授 (50262879)
鬼塚 貴志  国立研究開発法人日本原子力研究開発機構, その他部局等, 研究員(移行) (90422336)
土屋 文  名城大学, 理工学部, 教授 (90302215)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsウラン化合物 / 水素貯蔵 / 水素吸収放出特性 / 第一原理計算 / ウラン金属間化合物 / 水素化物 / 水素吸収 / 水素貯蔵材 / 結晶構造解析
Outline of Final Research Achievements

Hydrogen absorption properties of ZrNiAl-type uranium intermetallic compounds have been investigated experimentally and first principles calculations, which along with literature data are used to build uranium intermetallic compounds hydrogenation database. It revealed that especially UNiZn potentially absorbs more than 3H/U changing the crystal structure from ZrNiAl-type to AlB2-type with higher symmetry similarly to UNiAl. The U-H atomic distance of 0.24 nm in the stable structure is quite similar to that in UNiAl (0.235 nm), database average (0.232±0.013 nm) and binary hydride UH3, while these distances are significantly longer than other elemental systems. Transformability enabling the uniquely long U-H distance can be an important factor for an uranium compound with large hydrogen capacity.

Academic Significance and Societal Importance of the Research Achievements

ウラン金属は高い水素貯蔵能力を示し、その高い補足力から、水素の放射性同位元素であり核融合炉の燃料として必要なトリチウムの安全な貯蔵に利用されているが、その放出には高温加熱を要する。合金化し補足力を調整することにより、原子力や再生可能エネルギー発電の余剰電力を水の電解により水素へ変換―逆変換により充放電する電力平滑化システムへの水素貯蔵材としての応用も期待されている。本研究で得られた水素化に関するデータベースと総合的な理解は、既存のウラン化合物中から良好な水素吸収特性の材料を選び出すのみならず、さらに新たな水素化ウラン化合物を探索するための指針を与える重要な基礎となる。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2018 2017 2016

All Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Presentation] Defect Formation Energies Due to Hydrogen-dopants on Interstitial Sites in Uranium Intermetallic Compounds2018

    • Author(s)
      B. Tsuchiya, T. Yamamoto, K. Ohsawa, M. Yamawaki
    • Organizer
      4thEnergy Materials Nanotechnology (EMN) Meeting on Computation and Theory
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Search for Uranium Intermetallic Compounds with Superb Hydrogen Absorbability2018

    • Author(s)
      Michio Yamawaki, Takuya Yamamoto, Bun Tsuchiya, Yuji Arita, Takashi Onitsuka
    • Organizer
      The First International Symposium on the Chemical Material Frontiers in Metal and Nuclear Resources Utilization
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 第一原理計算によるウラン合金中水素の挙動解析2017

    • Author(s)
      鬼塚貴志, 中森文博, 有田裕二, 山本琢也, 大澤一人, 小無健司, 山中伸介, 山脇道夫
    • Organizer
      第6回IFERC-CSC研究会
    • Place of Presentation
      東京
    • Year and Date
      2017-01-10
    • Related Report
      2016 Research-status Report
  • [Presentation] 第一原理計算を用いたウラン金間化合物の水素吸収特性評価2017

    • Author(s)
      土屋文、山本琢也、鬼塚貴志、山脇道夫、大澤一人
    • Organizer
      日本金属学会 春の大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Study on Hydrogen Absorption Properties of Uranium Intermetallic Compounds to Search for High Performance Hydrogen Storage Material2016

    • Author(s)
      Michio Yamawaki, Takuya Yamamoto, Fumihiro Nakamori, Yuji Arita, Kazuo Ohsawa, Takashi Onitsuka
    • Organizer
      13th China-Japan Symposium on Materials for Advanced Energy Systems and Fission & Fusion Engineering (CJS-13)
    • Place of Presentation
      Hefei, China
    • Year and Date
      2016-09-26
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2021-02-19  

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