Hydrogen Storage Properties of Mg95Ni5-10 wt% PVP Composite Prepared by Stirring and Centrifugation Process

PVP was added to Mg-Ni hydrogen storage alloy (Mg95Ni5) by stirring and centrifugation process. The effect of PVP additive on hydrogen absorption/desorption property of Mg95Ni5 was investigated. The results showed that the addition of PVP did not change the phase structure of Mg95Ni5. The saturated hydrogen absorption capacities of Mg95Ni5-10 wt% PVP are 1.19 wt% at 373 K , 2.04 wt% at 423 K, 2.31 wt% at 473 K and 2.39 wt% at 523K, respectively, within 1 h. The samples had good hydriding kinetics at 423, 473 and 523 K, which reach their saturated hydrogen absorption capacity within 500 s. The hydrogen desorption capacity of 2.25 wt% was reached at 523 K.