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2014 年度 実績報告書

Mechanism of Activation of TiFe for Hydrogen Storage by High-Pressure Torsion

研究課題

研究課題/領域番号 25889043
研究機関九州大学

研究代表者

エダラテイ カベー  九州大学, カーボンニュートラル・エネルギー国際研究所, 学術研究員 (60709608)

研究期間 (年度) 2013-08-30 – 2015-03-31
キーワードHydrogen Storage / Energy Storage / Severe Deformation / High-Pressure Torsion / Activation / Deactivation / Metal Hydrides / Ultrafine Grains
研究実績の概要

TiFe is an excellent candidate for stationary hydrogen storage applications. However, TiFe does not absorb hydrogen easily because of surface oxidation. We showed that TiFe processed by HPT absorb hydrogen at room temperature. We showed that the activation of sample is due to (i) enhanced diffusion of hydrogen, (ii) segregation of catalytically active Fe-rich phase and (iii) formation of large fraction of grain boundaries as pathways to transport hydrogen through the oxide layer.
In order to investigate the importance of grain boundaries, TiFe was processed by four different routes and the activation was investigated. The annealed sample, with micrometer grain sizes, did not absorb hydrogen. The cold-rolled sample, with submicrometer-micrometer grain sizes, was partially activated. The HPT-processed sample, with nanometer-submicrometer grain sizes, was fully activated under 2 MPa. The ball-milled sample, with nanometer grain sizes, was fully activated under 1 MPa. Therefore, the activation becomes easier when the grain size is smaller.
In order to investigate the effect of grain boundaries on activation, two other intermetallics, TiFeMn and Mg2Ni, were used. TiFeMn was used to reduce the hydrogenation pressure, but TiFeMn also suffered from difficult activation. While TiFeMn after annealing did not absorb hydrogen, the HPT-processed sample absorbed hydrogen at room temperature under 0.7 MPa. Similar mechanism was observed in activation of Mg2Ni using HPT. The current part of study also confirms that the large fractions of grain boundaries are responsible for activation.

現在までの達成度 (段落)

26年度が最終年度であるため、記入しない。

今後の研究の推進方策

26年度が最終年度であるため、記入しない。

  • 研究成果

    (10件)

すべて 2015 2014

すべて 雑誌論文 (3件) (うち査読あり 3件、 謝辞記載あり 3件) 学会発表 (7件) (うち招待講演 1件)

  • [雑誌論文] Significance of grain boundaries and stacking faults on hydrogen storage properties of Mg2Ni intermetallics processed by high-pressure torsion2015

    • 著者名/発表者名
      K. Edalati, J. Matsuda, M. Arita, T. Daio, E. Akiba, Z. Horita
    • 雑誌名

      Acta Materialia

      巻: 92 ページ: 46-54

    • DOI

      doi:10.1016/j.actamat.2015.03.036

    • 査読あり / 謝辞記載あり
  • [雑誌論文] Hydrogen storage performance of TiFe after processing by ball milling2015

    • 著者名/発表者名
      H. Emami, K. Edalati, J. Matsuda, E. Akiba, Z. Horita
    • 雑誌名

      Acta Materialia

      巻: 88 ページ: 190-195

    • DOI

      doi:10.1016/j.actamat.2014.12.052

    • 査読あり / 謝辞記載あり
  • [雑誌論文] Activation of TiFe for hydrogen storage by plastic deformation using groove rolling and high-pressure torsion: Similarities and differences2014

    • 著者名/発表者名
      K. Edalati, J. Matsuda, A. Yanagida, E. Akiba, Z. Horita
    • 雑誌名

      International Journal of Hydrogen Energy

      巻: 39 ページ: 15589-15594

    • DOI

      doi:10.1016/j.ijhydene.2014.07.124

    • 査読あり / 謝辞記載あり
  • [学会発表] Hydrogen storage in TiFe plastically deformed by groove rolling and high-pressure torsion2014

    • 著者名/発表者名
      K. Edalati, J. Matsuda, A. Yanagida, E. Akiba, Z. Horita
    • 学会等名
      The International Conference on Hydrogen Embrittlement and Applications (Hy-SEA 2014)
    • 発表場所
      Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
    • 年月日
      2014-10-26 – 2014-10-30
  • [学会発表] Hydrogenation properties of HPT-processed Mg2Ni2014

    • 著者名/発表者名
      T. Hongo, K. Edalati, M. Arita, J. Matsuda, E. Akiba, Z. Horita
    • 学会等名
      Meeting on Application and Development of Next Generation Hydrides
    • 発表場所
      Tohoku University, Sendai, Japan
    • 年月日
      2014-10-21 – 2014-10-22
  • [学会発表] Improvement of hydrogen storage in TiFe by groove rolling and HPT2014

    • 著者名/発表者名
      K. Edalati, J. Matsuda, A. Yanagida, E. Akiba, Z. Horita
    • 学会等名
      The 155th JIM Annual Fall Meeting
    • 発表場所
      Nagoya University, Nagoya, Japan
    • 年月日
      2014-09-24 – 2014-09-26
  • [学会発表] Hydrogenation behaviour of Mg2Ni subjected to HPT process2014

    • 著者名/発表者名
      T. Hongo, K. Edalati, M. Arita, J. Matsuda, E. Akiba, Z. Horita
    • 学会等名
      The 155th JIM Annual Fall Meeting
    • 発表場所
      Nagoya University, Nagoya, Japan
    • 年月日
      2014-09-24 – 2014-09-26
  • [学会発表] Effect of high-pressure torsion on hydrogen storage properties of TiFe2014

    • 著者名/発表者名
      K. Edalati, J. Matsuda, E. Akiba, Z. Horita
    • 学会等名
      The 15th IUMRS International Conference in Asia (IUMRS-ICA 2014)
    • 発表場所
      Fukuoka University, Fukuoka, Japan
    • 年月日
      2014-08-24 – 2014-08-30
  • [学会発表] Hydrogen storage in nanostructured TiFe processed by high-pressure torsion2014

    • 著者名/発表者名
      [7]K. Edalati, J. Matsuda, M. Arita, T. Daio, H. Iwaoka, S. Toh, E. Akiba, Z. Horita
    • 学会等名
      The 14th International Symposium on Metal-Hydrogen Systems (MH2014)
    • 発表場所
      Salford, Manchester, UK
    • 年月日
      2014-07-20 – 2014-07-25
  • [学会発表] Improvement of activation and re-hydrogenation behaviors of TiFe2014

    • 著者名/発表者名
      E. Akiba, J. Matsuda, Y. Horita, K. Edalati, Z. Horita
    • 学会等名
      The 14th International Symposium on Metal-Hydrogen Systems (MH2014)
    • 発表場所
      Salford, Manchester, UK
    • 年月日
      2014-07-20 – 2014-07-25
    • 招待講演

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公開日: 2016-06-01  

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