▎ 摘　　要

Mg-Al alloy was prepared by sintering and mechanical alloying, and the effects of graphene (Gp), TiF3 and Gp/titanium (III) fluoride (TiF3) on the hydrogen storage properties of the Mg-Al alloy were studied. The results show that Gp and TiF3 could improve the hydrogen storage properties of Mg-Al alloy. In particular, Gp and TiF3 showed good synergistic effect for enhancing the hydrogen storage properties of Mg-Al alloy. For example, when 1.0 wt% of H-2 was absorbed/desorbed, the hydrogen adsorption/desorption temperature of the Mg-Al alloy and Mg-Al-M (M = Gp, TiF3, and TiF3@Gp) composites were 241/343 degrees C, 185/310 degrees C, 229/292 degrees C and 159/280 degrees C, respectively. For the Mg-Al alloy, the apparent activation energy was 176.5 kJ mol(-1), and it decreased to 139.8 kJ mol(-1), 171.6 kJ mol(-1), and 94.3 kJ mol(-1), with the addition of Gp, TiF3 and TiF3@Gp composites, respectively. Evidently, the comprehensive hydrogen storage properties of Mg-Al alloy were improved remarkably under the synergistic effect of Gp and TiF3. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.