Abstract
We report on the preparation and hydrogen desorption/absorption kinetics of nanocrystalline magnesium hydride (MgH2) added commercial TiO2by high-energy ball milling. The phase and composition of the as-milled powders are characterized by X-ray diffraction (XRD). The results show that the milled sample contained MgH2phase, small amount of Mg and various phases of TiO2such as tetragonal and orthorhombic structure. The effect of the milling time (10, 20 and 30 h) on the hydrogen desorption property of MgH2has been investigated and found that the milling time of 20 h has excellent dehydrogenation properties, which can release 3.3 wt% H2within 60 min at 300oC, which indicates that the kinetics of hydrogen desorption of MgH2-TiO2composite has been greatly enhanced compared to the pure MgH2. Moreover, hydrogen absorption kinetics of the sample milled 20 h has been studied and the hydrogen content is 0.7, 0.8 and 1.2 wt% H2at 250, 280 and 300oC within 60 min, respectively.
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