Effects of SnO2 on hydrogen desorption of MgH2

The hydrogen desorption properties of Magnesium Hydride (MgH2) ball milled with cassiterite (SnO2) have been investigated by X-ray powder diffraction and thermal analysis. Milling of pure MgH2 leads to a reduction of the desorption temperature (up to 60 K) and of the activation energy, but also to a...

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Bibliographic Details
Published in:International journal of hydrogen energy 2013-04, Vol.38 (11), p.4664-4669
Main Authors: Abdellatief, M., Campostrini, R., Leoni, M., Scardi, P.
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Ball milling
Energy
Exact sciences and technology
Fuels
Hydrogen
Hydrogen desorption
Hydrogen energy
Magnesium hydride
Structural defects
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Summary:The hydrogen desorption properties of Magnesium Hydride (MgH2) ball milled with cassiterite (SnO2) have been investigated by X-ray powder diffraction and thermal analysis. Milling of pure MgH2 leads to a reduction of the desorption temperature (up to 60 K) and of the activation energy, but also to a reduction of the quantity of desorbed hydrogen, referred to the total MgH2 present, from 7.8 down to 4.4 wt%. SnO2 addition preserves the beneficial effects of grinding on the desorption kinetics and limits the decrease of desorbed hydrogen. Best tradeoff – activation energy lowered from 175 to 148 kJ/mol and desorbed hydrogen, referred to the total MgH2 present, lowered from 7.8 to 6.8 wt% – was obtained by co-milling MgH2 with 20 wt% SnO2. ► SnO2 addition during milling of MgH2 stabilizes the β-MgH2 phase. ► SnO2 acts as a lubricant during the milling of MgH2, limiting the hydrogen loss. ► H2 desorption temperature and activation energy are markedly decreased.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2013.02.016