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Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling
Technical Unit for Material Technologies (UTTMAT), Research Centre of Casaccia, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Via Anguillarese 301, 00123 Rome, Italy
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Received: 30 July 2012; in revised form: 3 September 2012 / Accepted: 7 September 2012 / Published: 24 September 2012
Abstract: The effect of extended H2 sorption cycles on the structure and on the hydrogen storage performances of MgH2 powders with 5 wt% of Fe particle catalyst is reported. MgH2 powders with and without Fe have been ball milled under Argon, the doped MgH2 nanocomposite has been cycled under hydrogen pressure up to a maximum of 47 desorption and absorption cycles at 300 °C. After acceleration during the first 10 cycles, the kinetics behavior of doped MgH2 is constant after extended cycling, in terms of maximum storage capacity and rate of sorption. The major effect of cycling on particle morphology is the progressive extraction of Mg from the MgO shell surrounding the powder particles. The Mg extraction from the MgO shell leaves the catalyst particles inside the hydride particles. Many empty MgO shells are observed in the pure ball milled MgH2 upon cycling at higher temperature, suggesting that this enhancement of the extraction efficiency is related to the higher operating temperature which favors Mg diffusivity with respect to the H ion one.
Keywords: hydrogen storage; MgH2; cycling; magnesium; nanocomposites; ball milling; scanning electron microscopy (SEM)
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Montone, A.; Aurora, A.; Gattia, D.M.; Antisari, M.V. Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling. Catalysts 2012, 2, 400-411.
Montone A, Aurora A, Gattia DM, Antisari MV. Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling. Catalysts. 2012; 2(3):400-411.
Montone, Amelia; Aurora, Annalisa; Gattia, Daniele Mirabile; Antisari, Marco Vittori. 2012. "Microstructural and Kinetic Evolution of Fe Doped MgH2 during H2 Cycling." Catalysts 2, no. 3: 400-411.