Dehydrogenation Properties of LiAlH4 Doped with Rare Earth Oxides

The influences of Gd2O3 and Nd2O3 on the dehydrogenation properties of LiAlH4 were studied by PCT (pressure-composition-temperature) equipment and SEM (scanning electron microscope) analysis method. The results show that the samples doped with Gd2O3 and Nd2O3 have very good dehydrogenation properties under the same conditions. The studies on doping amount (0.5, 1, 2, 3, 4, 5, 6 mol%) demonstrate that the influences of Gd2O3 and Nd2O3 on the dehydrogenation amounts of LiAlH4 are very similar. With increasing of doping amount, the dehydrogenation amount of LiAlH4 shows a gradual decrease. Meanwhile, the starting time of hydrogen release for the doped LiAlH4 sample is shortened significantly. In addition, the influences of Gd2O3 and Nd2O3 doping on the microstructure of LiAlH4 are not obvious.