Development of new type Ni-Mg texture-like structure hydrogen absorber

Che Wei Hsu, Sheng Long Lee, Fu Kai Hsu, Jing Chie Lin

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6 Scopus citations

Abstract

This study demonstrated the feasibility of a novel Mg vapor deposition treatment on Ni foam to synthesize a Ni-Mg texture-like structure as a new type of hydrogen absorber. Energy dispersive spectrometry (EDS) yielded an estimative value of the weight percent ratio of Ni and Mg of 71.8 and 20.5 in as-prepared Ni-Mg texture-like structure. The microstructural changes were also characterized by X-ray diffraction (XRD) and the formed hydride tetragonal-MgH2 was confirmed. The unique combination of large surface area of catalyst (Ni) and hydrogen acceptor (Mg) reduced the hydrogenation and dehydrogenation temperatures and performed the capability of reversible hydrogen storage capacity up to 0.72 wt.% H2 at 25 °C. Ni-Mg texture-like structure achieved significant hydriding-dehydriding performances at lower temperature than traditional Mg-based hydrogen storage alloys. A possible hydrogen storage mechanism was also discussed where the catalytic Ni foam with large surface area was shown to be a vital factor in improving hydriding-dehydriding kinetics.

Original languageEnglish
Pages (from-to)5383-5387
Number of pages5
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number9
DOIs
StatePublished - May 2011

Keywords

  • Hydrogen storage
  • Metal hydride
  • Ni-Mg texture-like structure

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