Catalytic effect of niobium oxide on hydrogen storage properties of mechanically ball milled MgH2

Nobuko Hanada, Takayuki Ichikawa, Hironobu Fujii

研究成果: Article査読

26 被引用数 (Scopus)

抄録

We examined a catalytic effect of niobium oxide (Nb2O5) on the hydrogen storage properties of MgH2 prepared by mechanical ball milling method. The MgH2 composite doped with 1 mol% Nb2O5 by ball milling for 20 h desorbed hydrogen up to ∼6 mass% in the temperature range from 200 to 250 °C at the heating rate of 5 °C/min under a purified helium flow. After dehydrogenation at 200 °C, the product showed remarkable hydrogen absorption kinetics. A large amount of gaseous hydrogen up to ∼4.5 mass% was absorbed even at room temperature under 1 MPa hydrogen pressure within 15 s and finally its capacity reached up to 5 mass%. Furthermore, the valence state of Nb2O5 doped in MgH2 was examined by X-ray absorption near edge structure (XANES) measurement. The results indicated that additive Nb2O5 was reduced by MgH2 during mechanical milling. This suggests that the Nb compound, in which the valence state of Nb atom is less than 5+, acts as a catalyst for the hydrogen absorbing/desorbing kinetics.

本文言語English
ページ(範囲)49-50
ページ数2
ジャーナルPhysica B: Condensed Matter
383
1
DOI
出版ステータスPublished - 2006 8 15
外部発表はい

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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