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The development and preparation of composites with multiple active sites and multiple catalytic processes are of great significance for improving the hydrogen storage property of the Mg/MgH 2 system. Herein, a TiMn 2 -type Ti 0.90 Zr 0.10 Mn 1.30 Cr 0.40 V 0.30 hydrogen storage alloy and Sm 6.5 Mg 93.5 - x wt % Ti 0.90 Zr 0.10 Mn 1.30 Cr 0.40 V 0.30 ( x = 0, 5, 10, and 30) composites were successfully prepared. The TiMn 2 hydrogen storage alloy was stable throughout the hydrogen storage performance test. Owing to alloying and hydrogenation-ball-milling, in situ generated Sm 3 H 7 possessed abundant active sites for accelerating H diffusion, and the uniformly distributed TiMn 2 hydrogen storage alloy promoted H 2 dissociation/recombination in Sm 6.5 Mg 93.5 -10 wt % TiMn 2 composite. The Sm 6.5 Mg 93.5 -10 wt % TiMn 2 composite absorbed 4.04 wt % H 2 within 3600 s at 373 K and desorbed 4.41 wt % H 2 within 500 s at 623 K. The Sm 6.5 Mg 93.5 -10 wt % TiMn 2 composite exhibited excellent cycling stability with 97.0% retention of hydrogen absorption after 50 hydrogen absorption and desorption cycles. Microstructural analysis showed that Sm 3 H 7 and TiMn 2 catalytically active substances were dispersed in the Mg/MgH 2 system. The uniformly dispersed Sm 3 H 7 and TiMn 2 catalyst afforded the Sm 6.5 Mg 93.5 -10 wt % TiMn 2 composite with excellent kinetic properties.
Zhang et al. (Sat,) studied this question.