Synthesis of fine composite particles for hydrogen storage, starting from Mg-YNi2 mixture

S. Orimo, H. Fujii, M. Tabata

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We synthesized new composite particles for hydrogen storage on the basis of an idea of "particle designing". As starting materials, powders of Mg and YNi2 were selected. Fine composite particles containing mainly Mg2Ni could be designed by repetitive hydriding and dehydriding cycles at 673 K. In the synthesis process of the composite particles, the following two points were found to be essential for this technique. The first point is that, after being activated by the sequential processes of hydrogenation, amorphization and disproportionation, YNi2 reacts effectively with Mg. The second point is that evaporated Mg, which occurs during dehydriding, adheres to the surface of the activated YNi2 and accelerates a diffusion reaction to form Mg2Ni at the interface. In these composite particles, Mg2NiH4 is formed, even at 373 K, under a hydrogen pressure of 5 MPa.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalJournal of Alloys and Compounds
Volume210
Issue number1-2
DOIs
Publication statusPublished - 1994 Aug
Externally publishedYes

ASJC Scopus subject areas

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

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