Desorption behaviours from metal-N-H systems synthesized by ball milling

H. Y. Leng, T. Ichikawa, S. Isobe, S. Hino, N. Hanada, H. Fujii

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Three metal amides LiNH2, NaNH2 and Mg(NH 2)2 were synthesized by ball milling the metal hydrides under gaseous ammonia NH3 at room temperature. The decomposition behaviours from these metal amides were investigated by thermal desorption mass spectroscopy and thermogravimetry analysis methods. The results showed that LiNH2 decomposed at T>230° C and was transformed into the imide Li2NH with emitting NH3, while Mg(NH 2)2, decomposed at T>180° C and was transformed into MgNH and finally into Mg3N2 with emitting NH 3 within 500 ° C. Then, a new metal-N-H system composed of Mg(NH2)2 and LiH with a molar ratio of 3:8 was designed by ball milling treatment and examined the hydrogen storage properties. The results showed that this system could reversibly absorb/desorb a large amount of hydrogen (∼ 7 wt.%) at a moderate temperature and pressure, which was better than the system of LiNH2 and LiH for hydrigen storage.

Original languageEnglish
Pages (from-to)443-447
Number of pages5
JournalJournal of Alloys and Compounds
Volume404-406
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2005 Dec 8
Externally publishedYes

Keywords

  • Hydrogen storage materials
  • Mechanochemical synthesis
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

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

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