Characterization of microstructure and surface oxide of Ti1.2Fe hydrogen storage alloy

Ki Beom Park, Tae Wook Na, Young Do Kim, Jae Young Park, Jang Won Kang, Hyun Su Kang, Kwangsuk Park, Hyung Ki Park

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this study, we investigated the microstructures, hydrogen absorption kinetics, and oxide layers of TiFe and Ti1.2Fe hydrogen storage alloys. Whereas the TiFe alloy has a single phase, the Ti1.2Fe alloy is composed of three phases: TiFe, Ti2Fe, and Ti4Fe. Under no thermal activation process, the TiFe alloy does not absorb hydrogen, though the Ti1.2Fe alloy starts to absorb hydrogen after 4 min of incubation time. From the XPS results, it is revealed that the Ti concentration in the oxide layer on the Ti4Fe phase is higher than that on the TiFe phase, indicating that the Ti concentration in the oxide layer would be important in improving hydrogen absorption kinetics. Based on these results, the hydrogen absorption kinetics could be improved by adjusting composition, enabling the formation of a Ti-rich oxide layer.

Original languageEnglish
Pages (from-to)13082-13087
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume46
Issue number24
DOIs
StatePublished - 2021 Apr 6

Keywords

  • Hydrogen absorption kinetics
  • Hydrogen storage alloy
  • Surface oxide
  • TiFe alloy

Fingerprint

Dive into the research topics of 'Characterization of microstructure and surface oxide of Ti<sub>1.2</sub>Fe hydrogen storage alloy'. Together they form a unique fingerprint.

Cite this