Abstract
LiBH 4+1/2MgH 2 is a promising reactive hydride composite for hydrogen storage. In the present study, three Ce-based additives were used as catalysts to enhance the hydrogen storage performance of LiBH 4+1/2MgH 2 composites. The composites with Ce additives demonstrated significantly improved dehydrogenation kinetics and cyclic stability compared with the pure composite. X-ray diffraction and scanning electron microscopy analyses clearly revealed the phase transitions and morphological evolution during the hydriding-dehydriding cycling. The composites with Ce-based additives displayed stable nanostructures, in contrast to the rapid microstructural deterioration in the uncatalyzed composite. The CeB 6 formed in the composites had a particle size of 10 nm after five cycles. It may act as the nucleus for MgB 2 formation during dehydrogenation and thus account for the structural and performance stability of the composites upon cycling.
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