Microstructural evolution of ball-milled Mg-Ni powder during hydrogen sorption

A. Révész, Marcell Gajdics, Tony Spassov

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Ball-milling of Mg75Ni25 powder blends were carried out in a SPEX-8000 shaker mill. The morphology and microstructure of the milled powders were studied by scanning electron microscopy and X-ray diffraction, respectively. The dehydrogenation process of the sample milled for 10 h was stopped at different hydrogen contents (25, 50 and 75 percent of the maximum capacity) in a Sieverts' type apparatus, in order to achieve partially desorbed states. For comparison, the fully hydrided (100 percent) and the fully dehydrided (0 percent) states were also obtained. Convolutional multiple whole profile fitting analysis of the corresponding X-ray powder diffractograms was carried out in order to monitor the evolution of microstructural parameters during desorption, such as average coherent crystallite size and size distribution of two hydrides (Mg2NiH4 and Mg 2NiH0.3) that nucleate during the hydrogenation of Mg-Ni powders. The desorption induced changes in the relative amount of the hydride phases were also quantified. ©

Original languageEnglish
Pages (from-to)8342-8349
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number20
DOIs
Publication statusPublished - Jul 9 2013

Fingerprint

Microstructural evolution
sorption
Sorption
balls
Powders
Hydrogen
hydrogen
Hydrides
hydrides
Desorption
desorption
Ball milling
Dehydrogenation
Crystallite size
dehydrogenation
Hydrogenation
hydrogenation
x rays
X ray diffraction
X rays

Keywords

  • Ball milling
  • Hydrogen storage
  • Mg-based
  • Microstructure
  • Partial desorption

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Microstructural evolution of ball-milled Mg-Ni powder during hydrogen sorption. / Révész, A.; Gajdics, Marcell; Spassov, Tony.

In: International Journal of Hydrogen Energy, Vol. 38, No. 20, 09.07.2013, p. 8342-8349.

Research output: Contribution to journalArticle

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