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Fast hydrogen sorption from MgH2-VO2(B) composite materials

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2016
Authors
Milošević, Sanja S.
Kurko, Sandra V.
Pasquini, Luca
Matović, Ljiljana
Vujasin, Radojka
Novaković, Nikola
Grbović-Novaković, Jasmina
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Abstract
The hydrogen sorption kinetics of MgH2-VO2(B) composites synthesised by mechanical milling have been studied. The microstructural properties of composites were characterized by means of X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM), Particle size analysis (PSD), while sorption behaviour was followed by differential scanning calorimetry (DSC) and Sievert measurements. Results have shown that although desorption temperature reduction is moderate; there is a substantial improvement in hydrogen sorption kinetics. The complete desorption of pure MgH2 at elevated temperature takes place in more than 30 min while the composite fully desorbs in less than 2 min even at lower temperatures. It has been shown that the metastable gamma-MgH2 phase and the point defects have a decisive role in desorption process only in the first sorption cycle, while the second and the subsequent sorption cycles are affected by microstructural and morphological characteristics of th...e composite. (C) 2015 Elsevier B.V. All rights reserved.

Keywords:
MgH2 / VO2 (B) / Composites / Ball milling / Kinetics / (de)sorption
Source:
Journal of Power Sources, 2016, 307, 481-488
Projects:
  • Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)

DOI: 10.1016/j.jpowsour.2015.12.108

ISSN: 0378-7753; 1873-2755

WoS: 000370884000059

Scopus: 2-s2.0-84954053650
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URI
http://vinar.vin.bg.ac.rs/handle/123456789/274
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Vinča

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