An investigation of long-term degradation of Mm Ni5-based hydrogen-absorbing alloys by water vapor

Koki Terui, Toshiyuki Hirosawa, Yutaka Sangu, Yohsuke Matsushita, Hideyuki Aoki, Takatoshi Miura, Yoshiaki Kawakami

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The effects of long-term absorption-desorption testing with hydrogen containing water vapor and of reactivation on the hydrogen absorption-desorption properties of hydrogen-absorbing alloys were experimentally investigated. With absorption times, the hydrogen-absorbing alloys degraded in the first several cycles. In subsequent cycles, the degraded alloys recovered and degraded again due to the pulverization. On reactivation with pure hydrogen, the hydrogen absorbing-desorbing capacity and rate of hydrogen absorption-desorption recovered, but the hydrogen-absorbing capacity did not recover completely to that before degradation, due to the extrinsic degradation.

Original languageEnglish
Pages (from-to)396-402
Number of pages7
Journalkagaku kogaku ronbunshu
Issue number4
Publication statusPublished - 2009 Oct 21


  • Degradation
  • MmNi5-based Hydrogen-absorbing alloys
  • Reactivation
  • Water vapor

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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