Enhancement of the hydrogen storage properties of Mg/C nanocomposites prepared by reactive milling with molybdenum

Abstract

The effect of Mo on the morphology, crystal structure and hydrogen sorption properties of Mg/C composites prepared by reactive milling was studied. Transmission electron microscopic (TEM) observation shows that Mg/C composites prepared with the addition of Mo are of nanoscale with particle size about 20-120 nm after 3 h of milling under 1 MPa H₂. MgH₂ of tetrahedral crystal structure predominates in the materials with the geometric shape of oblique hexagonal prism. From X-ray diffraction (XRD) and hydrogen content studies, Mo and crystallitic carbon have a synergistic effect on promoting the hydrogenation rate in the reactive milling process. From differential scanning calorimetric (DSC) studies, the dehydrogenation peak temperature of the Mg/C materials with Mo is lowered to 299-340 °C.

Keywords

magnesium hydride / reactive milling / hydrogenation rate / dehydrogenation temperature

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