Study On Nanocomposite Of Mg/C For Hyadorgen Storage

The project focused on improving the hydriding-dehydriding properties of Mg-base hydrogen storage materials as well as discovering new raw materials in order to reduce material cost. Mechanical ball milling was selected as the method to prepare the nanocomposites of magnesium and two types of carbon: carbonized anthracite carbon and graphite carbon.Some key factors influencing the efficiency of ball milling were discussed in the paper. Compared with wet milling and dry milling in the presence of H₂ and N₂, reactive mechanical ball milling was proved to be the best way to prepare the nanocomposite of magnesium and carbonized anthracite carbon. The changes in particle size and crystal structure during the course of ball milling were characterized by transmission electron microscope (TEM) and scanning electron microscopy (SEM).The dehydriding temperature and dehydriding capacity were evaluated by differential scanning calorimeter (DSC) and thermogravimetric analysis (TG). The effects of carbonized anthracite, Ni and Mo as additives on the hydriding-dehydriding properties of nanocomposite from magnesium and carbon were discussed in details. A new method was established and proved to be correct, in which hydriding capacity was evaluated by carbon hydrogen elements analysis instrument.Based on characterization results, the hydriding mechanism of nanocomposite from magnesium and carbon was investigated as well as the reasons for crystal structure transformation in hydriding-dehydriding cycles.