Effect of Ti catalyst with different chemical form on Li-N-H hydrogen storage properties

S. Isobe, T. Ichikawa, N. Hanada, H. Y. Leng, M. Fichtner, O. Fuhr, H. Fujii

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

The effect of some different type Ti additives on kinetics of the reaction, LiH+LiNH2↔Li2NH+H2, was intensively investigated in this work. The mixture of LiH and LiNH2 powders with the 1:1 molar ratio and Ti additives with different chemical form were mechanically ball milled under a hydrogen gas atmosphere of 1 MPa at 400 rpm for 2 h and the measurements of thermal hydrogen desorption spectrum (TDS), thermogravimetry (TG) and X-ray diffraction (XRD) were performed. Here, we used Ti (nano particle), Ti (micro particle), TiCl 3, TiO2 (nano particle) and TiO2 (micro particle) as the additives. The results indicated that the Tinano, TiCl3 and TiO2nano doped composites revealed a superior catalytic effect on the TDS properties, while the Timicro and TiO2micro did not show so good catalytic effect being similar to the sample without any additives. In the XRD profiles, there are traces of Ti and TiO2 phases in the Timicro and TiO2micro doped composites, respectively, whereas no trace of Ti, TiCl3 and TiO2 was found in the Tinano, TiCl3 and TiO2nano doped composites. These results indicate that the uniform distribution of nano particle Ti metal between LiH and LiNH2 plays an important role for catalytic effect.

Original languageEnglish
Pages (from-to)439-442
Number of pages4
JournalJournal of Alloys and Compounds
Volume404-406
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2005 Dec 8

Keywords

  • Gas-solid reactions
  • High-energy ball milling
  • Hydrogen storage materials
  • Nanostructures
  • Thermal analysis

ASJC Scopus subject areas

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

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