Hydrogen absorption-desorption properties of hydrogen-absorbing MmNi 5-based alloy degradation by water vapor and after reactivation

Toshiyuki Hirosawa, Yutaka Sangu, Yohsuke Matsushita, Yoshio Morozumi, Hideyuki Aoki, Takatoshi Miura, Yoshiaki Kawakami

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, the effect of water vapor on the hydrogen absorption-desorption properties of a hydrogen- absorbing MmNi5-based alloy (MmNi4.04Mn0.31Co0.60Al0.05) was investigated. When pure hydrogen used, the hydrogen-absorbing capacity decreased slightly with the number of absorption-desorption cycles. However, when hydrogen containing water vapor was used, the hydrogen-absorbing capacity decreased significantly, due to a decrease in the rate of hydrogen absorption-desorption, and the rate of absorption-desorption decreased with an increase in cycle number and water vapor concentration. After reactivation of the alloy, the hydrogen-absorbing capacity recovered. However, the hydrogen-desorbing capacity and the rate of hydrogen absorption-desorption did not increase significantly compared, with those before the reactivation. Thus, the reactivation tested in this study was effective only for hydrogen desorption from alloy was not completed, hydrogen desorption.

Original languageEnglish
Pages (from-to)376-382
Number of pages7
Journalkagaku kogaku ronbunshu
Volume33
Issue number4
DOIs
Publication statusPublished - 2007 Oct 29

Keywords

  • Degradation
  • Hydrogen-absorbing alloy
  • Reactivation
  • Water vapor

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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