Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion

Kaveh Edalati, Huaiyu Shao, Hoda Emami, Hideaki Iwaoka, Etsuo Akiba, Zenji Horita

研究成果: Contribution to journalArticle査読

33 被引用数 (Scopus)

抄録

Ti-V alloys thermodynamically absorb hydrogen at room temperature, but hydrogenation does not occur practically without a sophisticated activation process. In this study, a nanograined TiV alloy with the supersaturated bcc structure and an ultrahigh density of edge dislocations (>1016 m-2) was mechanically synthesized from Ti and V powders using the high-pressure torsion (HPT) method. The presence of large fractions of grain boundaries and dislocations, as effective pathways for hydrogen diffusion, activated TiV and it absorbed ∼4 wt.% of hydrogen at room temperature after an incubation period. The kinetic measurements suggested that the hydrogen absorption in the incubation period is controlled by the slow rate of hydrogen dissociation, while the hydrogenation rate in the latter stage is controlled by diffusion of hydrogen atoms.

本文言語英語
ページ(範囲)8917-8924
ページ数8
ジャーナルInternational Journal of Hydrogen Energy
41
21
DOI
出版ステータス出版済み - 6 8 2016

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 凝縮系物理学
  • エネルギー工学および電力技術

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