AI Article Synopsis
- A magnesium hydride composite with better hydrogen release was created using a simple method that combines MgH2 with LiCl at room temperature and treats it with THF under an argon atmosphere.
- The resulting composite consists of around 18% orthorhombic γ-MgH2 and 80% tetragonal β-MgH2, showing a hydrogen capacity of 6.6 wt% and starting to release hydrogen at about 260 °C, significantly lower than that of regular MgH2.
- The composite's enhanced performance is due to its nanostructure and the presence of the less stable γ-MgH2, which either releases hydrogen directly or converts to stable β-Mg
Article Abstract
A magnesium hydride composite with enhanced hydrogen desorption kinetics can be synthesized via a simple wet chemical route by ball milling MgH2 with LiCl as an additive at room temperature followed by tetrahydrofuran (THF) treatment under an Ar atmosphere. The as-synthesized composite comprises ca. 18 mass% orthorhombic γ-MgH2 and 80 mass% tetragonal β-MgH2 as submicron-sized particles. The β-/γ-MgH2 nanocomposite exhibits a dehydrogenation capacity of 6.6 wt% and starts to release hydrogen at ∼260 °C; ca. 140 °C lower than that of commercial MgH2. The apparent activation energy for dehydrogenation is 115 ± 3 kJ mol(-1), which is ca. 46% lower than that of commercial MgH2. Analysis suggests that the meta-stable γ-MgH2 component either directly dehydrogenates exothermically or first transforms into stable β-MgH2 very close to the dehydrogenation onset. The improved hydrogen release performance can be attributed both to the existence of the MgH2 nanostructure and to the presence of γ-MgH2.
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| http://dx.doi.org/10.1039/c5cp07762a | DOI Listing |
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