Hydrogen absorption and desorption by the Li-Al-N-H system

Yoshitsugu Kojima, Mitsuru Matsumoto, Yasuaki Kawai, Tetsuya Haga, Nobuko Ohba, Kazutoshi Miwa, Shin Ichi Towata, Yuko Nakamori, Shin Ichi Orimo

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Lithium hexahydridoaluminate Li3AlH6 and lithium-amide LiNH2 with 1:2 molar ratio were mechanically milled, yielding a Li-AI-N-H system. LiNH2 destabilized Li 3AlH6 during the dehydrogenation process of Li 3AlH6, because the dehydrogenation starting temperature of the Li-AI-N-H system was lower than that of Li3AlH6. Temperature-programmed desorption scans of the Li-AI-N-H system indicated that a large amount of hydrogen (6.9 wt %) can be released between 370 and 773 K. After initial H2 desorption, the H2 absorption and the desorption capacities of the Li-AI-N-H system with a nano-Ni catalyst exhibited 3-4 wt % at 10-0.004 MPa and 473-573 K, while the capacities of the system without the catalyst were 1-2 wt %. The remarkably increased capacity was due to the fact that the kinetics was improved by addition of the nano-Ni catalyst.

Original languageEnglish
Pages (from-to)9632-9636
Number of pages5
JournalJournal of Physical Chemistry B
Issue number19
Publication statusPublished - 2006 May 18

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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