Mechanochemical synthesis of Ce 3 Al 11 powder and its catalytic effect on the hydrogen sorption properties of NaAlH 4

Jongkwan Choi, Taejun Ha, Jihye Park, Young Su Lee, Heung Nam Han, Joonho Lee, Jae Hyeok Shim

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2 Citations (Scopus)

Abstract

Mechanochemical synthesis of the Ce 3 Al 11 powder was performed through a reaction among CeCl 3 , AlCl 3 and NaH powders. α-Ce 3 Al 11 particles with an average size of 250 nm were obtained. The catalytic effect of the synthesized Ce 3 Al 11 on the hydrogen sorption properties of NaAlH 4 was investigated. The hydrogen absorption kinetics of NaAlH 4 with Ce 3 Al 11 was significantly enhanced and the hydrogen capacity was improved compared to those properties of NaAlH 4 with CeCl 3 . This can be attributed to the fine distribution of the Ce 3 Al 11 catalyst in NaAlH 4 during ball milling. Although the volume of the NaAlH 4 pellets generally tends to increase during the hydrogen sorption cycles, the volume expansion of the pellet of NaAlH 4 with Ce 3 Al 11 was relatively low with a small pore fraction compared to that of the pellet of NaAlH 4 with conventional chloride catalysts such as CeCl 3 , TiCl 3 and TiCl 4 . The use of a nonchloride catalyst appears to provide an effective approach for suppressing the volume expansion of NaAlH 4 pellets during the hydrogen sorption cycles.

Original languageEnglish
Pages (from-to)313-318
Number of pages6
JournalJournal of Alloys and Compounds
DOIs
Publication statusPublished - 2019 May 5

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Keywords

  • Hydrogen absorbing materials
  • Intermetallics
  • Mechanochemical processing
  • Metal hydrides
  • Scanning electron microscopy
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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