Microstructural investigation of nanocrystalline hydrogen‐storing Mg‐titanate nanotube composites processed by high‐pressure torsion

Marcell Gajdics, Tony Spassov, Viktória Kovács Kis, Ferenc Béke, Zoltán Novák, Erhard Schafler, Ádám Révész

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A high-energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium samples catalyzed by TiO2 or titanate nanotubes. The microstructure of the as-milled powders and the torqued bulk disks was characterized by X-ray diffraction. The recorded diffractograms have been evaluated by the convolutional multiple whole profile fitting algorithm, which provided microstructural parameters (average crystal size, crystallite size distribution, average dislocation density). The morphology of the nanotube-containing disks has been examined by high-resolution transmission electron microscopy. The effect of the different additives and preparation conditions on the hydrogen absorption behavior was investigated in a Sieverts’-type apparatus. It was found that the ball-milling route has a prominent effect on the dispersion and morphology of the titanate nanotubes, and the absorption capability of the Mg-based composite is highly dependent on these features.

Original languageEnglish
Article number563
JournalEnergies
Volume13
Issue number3
DOIs
Publication statusPublished - Jan 1 2020

    Fingerprint

Keywords

  • Ball milling
  • High-pressure torsion
  • Hydrogen storage
  • Magnesium
  • Titanate nanotubes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this