Microstructural and morphological investigations on Mg-Nb<sub>2</sub>O<sub>5</sub>-CNT nanocomposites processed by high-pressure torsion for hydrogen storage applications

Author(s)
Marcell Gajdics, Tony Spassov, Viktória Kovács Kis, Erhard Schafler, Ádám Révész
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.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Eötvös Loránd University Budapest, Sofia University "St. Kliment Ohridski", Hungarian Academy of Sciences
Journal
International Journal of Hydrogen Energy
Volume
45
Pages
7917-7928
No. of pages
12
ISSN
0360-3199
DOI
https://doi.org/10.1016/j.ijhydene.2019.06.165
Publication date
07-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Nanomaterials, Energy storage
Keywords
ASJC Scopus subject areas
, , ,
Portal url
https://ucris.univie.ac.at/portal/en/publications/microstructural-and-morphological-investigations-on-mgnb2o5cnt-nanocomposites-processed-by-highpressure-torsion-for-hydrogen-storage-applications(1f0547b3-9e45-4a0b-94cf-8a929afc5144).html