Low-temperature chemical synthesis of intermetallic TiFe nanoparticles for hydrogen absorption

Yasukazu Kobayashi, Shohei Yamaoka, Shunta Yamaguchi, Nobuko Hanada, Shohei Tada, Ryuji Kikuchi

Research output: Contribution to journalArticlepeer-review

Abstract

Nanosizing of TiFe hydrogen storage alloy is conducted to facilitate its activation. Here, pure intermetallic TiFe nanoparticles (45 nm) were prepared using chemical reduction of oxide precursors at 600 °C, which is the lowest temperature ever used in chemical synthesis. This was achieved using a strong reducing agent (CaH2) in a molten LiCl. When used for hydrogen absorption, the obtained nanoparticles surprisingly exhibited almost no hydrogen absorption. The results demonstrated that TiFe nanoparticles are more difficult to activate than the bulk powder because the oxidized surface layers of the nanoparticles become stabilized, which prevents the morphological change necessary for their activation.

Original languageEnglish
Pages (from-to)22611-22617
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume46
Issue number43
DOIs
Publication statusPublished - 2021 Jun 23

Keywords

  • Calcium hydride
  • Chemical synthesis
  • Hydrogen absorption
  • Intermetallic TiFe
  • Nanoparticles

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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