Optimization of the First Hydrogenation Reaction Via Introducing Active Sites Through Y-Doping

Mg-based hydrogen storage alloys are considered as hydrogen storage materials with great development potential, but their sluggish kinetics restrict their applications. Activation property is also considered to be one of the important indicators for evaluating the performance of hydrogen storage alloys. In this study, as the doping amount of Y element increases, the grain size decreases and the initial hydrogenation performance gradually improves. The first hydrogenation time of Y1 sample is only 8554 s. Due to the strong affinity between Y and H atoms, the number of active sites increases, which shortens the "incubation period" and accelerates the adsorption and dissociation process of H molecules.