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Applied Physics Letters / Volume 96 / Issue 22 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 96, 223109 (2010); http://dx.doi.org/10.1063/1.3442910 (3 pages)

Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Shigehito Isobe, Akifumi Ono, Hao Yao, Yongming Wang, Naoyuki Hashimoto, and Somei Ohnuki

Graduate School of Engineering, Hokkaido University, N-13, W-8, Sapporo 060-8278, Japan

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(Received 6 April 2010; accepted 10 May 2010; published online 2 June 2010)

In situ observation on dehydrogenation of MgH2 was performed by using transmission electron microscope (TEM). The dehydrogenation of MgH2 with 1 mol % Nb2O5 and formation of nanosized Mg particles were observed at 150 °C. Nb2O5 was not confirmed in diffraction patterns and TEM images probably due to wide dispersion. On MgH2 with 10 mol % Nb2O5, the high resolution TEM could recognize the dehydrogenation at the interface between MgH2 and Nb2O5, proceeding with increasing temperature. This suggests that hydrogen atoms could diffuse from MgH2 phase to the interface between Mg and Nb2O5, resulting in formation of hydrogen molecules at the interface.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

chemical analysis, chemical interdiffusion, hydrogen, hydrogen storage, magnesium compounds, nanoparticles, pyrolysis, thermally stimulated desorption, transmission electron microscopy

PACS

  • 68.43.Vx

    Thermal desorption

  • 82.30.Lp

    Decomposition reactions (pyrolysis, dissociation, and fragmentation)

  • 88.30.R-

    Hydrogen storage

  • 82.80.-d

    Chemical analysis and related physical methods of analysis

  • 68.35.Fx

    Diffusion; interface formation

  • 68.37.Lp

    Transmission electron microscopy (TEM)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3442910

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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