The Effect of Nickel and Graphite on the Hydrogen Storage Ability of Magnesium in the First Cycle

چکیده مقاله

Magnesium can serve as a solid-state hydrogen-storage material, and over recent years it has been taken into consideration owing to its high storage capacity. The effect of 10 wt % nickel and graphite (G) on hydrogen sorption of magnesium was compared. The powder mixture was mechanically milled for 35 h under an argon atmosphere. A Sievert apparatus was used for hydrogen sorption analysis. Scanning electron microscopy and X-ray diffraction were used for morphological characterization. Hydrogen sorption analysis was performed at 3.5 MPa and 473 K. The results showed that graphite had a better effect than nickel on the hydrogen storage properties of magnesium owing to a greater reduction in the particle size of magnesium and the physisorption of hydrogen by graphite. The hydrogen adsorption of Mg+10 wt % G was also investigated at 2.0, 3.5, and 4.0 MPa, and it was found that the compound adsorbed 5.7 wt % hydrogen at 4.0 MPa because hydrogen could penetrate into the inner parts of the magnesium powder at higher pressure.