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

Abstract

AbstractMagnesium 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.