Microstructural and morphological investigations on Mg-Nb2O5-CNT nanocomposites processed by high-pressure torsion for hydrogen storage applications

Marcell Gajdics, Tony Spassov, Viktória Kovács Kis, Erhard Schafler, Ádám Révész

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Abstract

A combined deformation process of high energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium powders catalyzed by Nb2O5 and/or multiwall carbon nanotubes. The effect of the different additives on the kinetics of the milled powders and the bulk disks produced by simultaneous uniaxial compression and severe shear deformation was examined in a Sieverts’-type apparatus. The microstructure and the morphology of the as-processed samples and the additives were characterized by X-ray diffraction and high-resolution transmission electron microscopy, respectively. Microstructural changes and morphological alterations after several absorption-desorption cycles were also studied. It was found that high-pressure torsion has significantly changed the texture of magnesium and the shape of carbon nanotubes. The combined use of Nb2O5 and carbon nanotubes was found to improve the desorption kinetics of Mg. Influence of the additives and processing methods on the evolution of the microstructure will also be demonstrated.

Original languageEnglish
Pages (from-to)7917-7928
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number14
DOIs
Publication statusPublished - Mar 13 2020

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Keywords

  • Ball milling
  • Carbon nanotubes
  • High pressure torsion
  • Hydrogen storage
  • Kinetics
  • Magnesium

ASJC Scopus subject areas

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

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