Magnesium-based hydrogen storage nanomaterials prepared by high energy reactive ball milling in hydrogen at the presence of mixed titanium-iron oxide

摘要

An experimental study was undertaken on the preparation, by High Energy Reactive Ball Milling in Hydrogen (HRBM), of hydrogen storage materials on the basis of Mg mixed with FeTiO3, and their further characterisation (SEM, TEM, XRD, volumetric H-2 absorption studies, TDS). It was shown that the addition of >= 5 wt.% of FeTiO3 dramatically improves H absorption in Mg and reduces the temperature of further H desorption. Subsequent addition of carbon, including Graphite (G), Activated Carbon (AC) and Multi-Wall Carbon Nanotubes (MWCNT) results in some slowing of the H absorption down but significantly improves re-hydrogenation performances of the material, which in time is able to re-absorb about 5 wt.% H in less than 5-7 min (15 bar H-2/250 degrees C). These improvements were associated with the reduction of FeTiO3 to yield nanoparticles of Fe and TiFe(Hx). (C) 2014 Elsevier B.V. All rights reserved.