Magnesium (Mg)-based alloys have already been widely studied as the hydrogen storage materials because of their high reversible hydrogen storage capacity, low cost, and light weight, etc. However, the poor de/hydrogenation kinetic properties dramatically hinder the practical applications. In this work, the MgH2-ANi5 (A = Ce, Nd, Pr, Sm, and Y) composites have been prepared by a high-energy ball milling, which can effectively refine the particle size thus improving the kinetic properties. Experimental results reveal that the MgH2-ANi5 composites mainly consist of Mg2NiH4, MgH2 and Rare earth (RE) hydride, which will be dehydrogenated to form Mg2Ni, Mg and stable RE hydride reversibly. Accordingly, the as-milled MgH2-ANi5 (A = Ce, Nd, Pr, Sm, and Y) composites with various A-elements can respectively contribute a reversible hydrogen storage capacity of 6.16 wt%, 5.7 wt%, 6.21 wt%, 6.38 wt%, and 6.5 wt% at a temperature of 300 °C, and show much better kinetic properties in comparison with the pure MgH2 without any additive. In-situ formed Mg2Ni and stable RE hydride (such as CeH2.73 and YH2) might act as effective catalysts to significantly improve the hydrogen storage properties of MgH2. The present work provides a guideline on improving the kinetic properties of the Mg-based hydrogen storage alloys.
- Kinetic properties
- Mg-based hydrogen storage alloy
- Rare earths
ASJC Scopus subject areas
- Geochemistry and Petrology