Hydrogen storage and electrochemical characteristics of Ti 0.32Cr 0.43 - XV 0.25Fe x (x = 0-0.08) alloys and its composites with LmNi 4.1Al 0.25Mn 0.3Co 0.65 alloy

Han Sol Park, Muralidhar Chourashiya, Dong Cheol Yang, Choong Nyeon Park, Chan Jin Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This study examined the hydrogen storage and electrochemical characteristics of bcc type Ti 0.32Cr 0.43 - xV 0.25Fe x (x = 0-0.08) alloys and their ball-milled composites with AB 5 type LmNi 41Al 0.25Mn 0.3Co 0.65 alloy. With increasing Fe content in the bcc alloy, the hydrogen storage capacity decreased and the plateau pressure increased due to the decreased lattice volume. In addition, the plateau pressure of the bcc alloys decreased with decrease in its temperature. The discharge capacity of the composite alloys of bcc and AB 5 alloy decreased with increasing Fe content in the bcc alloy at 25 °C, attributed to the increased plateau pressure. On the other hand, at low temperatures, the discharge capacity of the Fe-doped composite alloys was higher than that of the un-doped alloy due to the catalytic effect of Fe. In addition, with increasing discharge rate, the Fe-doped composite alloys with improved surface catalytic activity showed better discharge capacity.

Original languageEnglish
Pages (from-to)566-572
Number of pages7
JournalJournal of Alloys and Compounds
Volume513
DOIs
StatePublished - 5 Feb 2012
Externally publishedYes

Keywords

  • Ball-milling
  • Discharge capacity
  • Fe substitution
  • Hydrogen storage
  • Plateau pressure
  • Surface catalytic activity
  • Ti-Cr-V alloy

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