Abstract
To understand the effect of rare earth atomic radius on hydrogen storage properties of layered R-Mg-Ni compounds, the hydrogen absorption-desorption characteristics of R2MgNi9 (R = Nd, Gd and Er) compounds have been investigated in this work. As the radii of rare earth atoms decrease from Nd to Gd and Er, the lattice parameters (a and c) decrease gradually, leading to the decreases in dehydriding enthalpies and hydrogen capacities. Additionally, the cycle stabilities also decrease from Nd2MgNi9 to Gd2MgNi9 and Er2MgNi9 because their lattice strains increase after 50 cycles.
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