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Yunfeng ZhuNanjing Tech UniversityMagnesium-based Hydride For Hydrogen Storage Improved By The Methods Of Alloying, Nano-sizing, Catalyzing And Compositing Prepared By Hydriding Combustion Synthesis Plus Mechanical Milling 5th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development Back to Plenary Lectures » |
Abstract:Magnesium-based hydride, which is a representative metal hydride, has been studied widely as the promising solid state hydrogen storage material due to its merits of light weight, high gravimetric (7.6 wt.%) and volumetric hydrogen storage capacity (110 g/L), low cost, abundant resource and environmental friendliness. However, the high working temperature and sluggish hydrogen sorption kinetics still restrict its practical application. To solve this problem, we have improved the hydrogen storage properties of magnesium-based hydride by the process of hydriding combustion synthesis plus mechanical milling and the methods of alloying, nano-sizing, catalyzing and compositing. In this report, we will introduce our recent progress of the enhancement in hydrogen storage properties of magnesium-based hydride. In particular, the magnesium-based hydride doped by various catalysts exhibits superior hydriding/dehydriding kinetics at lowered temperatures. Hybrid catalysts, such as bimetallic catalyst, carbon supported nano metal or metal oxide shows obvious effect on the hydrogen sorption kinetics of magnesium hydride. Synergistic catalytic effect between the catalyst components has been clarified. By adding carbon supported nano-nickel catalyst, the onset desorption temperature of MgH2 can be reduced to 187 °C, which is 113 °C lower than the as-milled MgH2. Our results also demonstrate the influence of shape and size of metal-based catalysts on the MgH2 system, which is helpful for designing nanostructured catalysts with ultra-fine particle size, well-formed distribution and high activity. Moreover, the novel Mg-Ni-hydride nanoparticles with ultrahigh structural stability and hydrogen storage activity derived from microencapsulated nanoconfinement have been presented. References:[1] L. Schlapbach, A. Zuttel, Nature 414 (2001) 353-358. |
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