Excellent kinetics and effective hydrogen storage capacity at low temperature of superlattice rare-earth hydrogen storage alloy by solid-phase treatment

The gaseous hydrogen storage properties of superlattice rare-earth hydrogen storage alloy working at low temperature were investigated and prepared with doping AlH3. The phase composition, kinetic and thermodynamic characteristics of the composite were characterized. The results revealed that the alloy doped with 3 wt% AlH3 had better performance and the maximum hydrogen absorption capacity reached 1.384 wt%, 1.334 wt% and 1.231 wt% at 273 K, 263 K and 253 K, respectively. The hydrogen desorption ability also was enhanced by 202% at 273 K and 192% at 253 K compared to the pristine. The improvement could be ascribed to the solid-phase activation treatment and surface modification using chemical hydride during ball-milling method, which makes it easier for hydrogen desorption.