▎ 摘　　要

A reduced graphene oxide (rGO)-supported V2O3 was synthesized via an impregnation method and then introduced (through mechanical milling) into the Mg85Al15 alloy. The results indicated that the combined effect of V2O3 and rGO played an important role in destabilizing the stability of Mg85Al15 alloy hydrides. When absorbed 1.0 wt% of H-2, it was needed to heat the bare alloy to 220 degrees C at a rate of 2 degrees C.min(-1). This temperature dropped to 181 degrees C and 192 degrees C, respectively, when V2O3 and rGO were used separately as catalysts. The temperature further decreased to 155 degrees C under the combined effect of V2O3 and rGO. At 250 degrees C, a complete reversible hydrogenation/dehydrogenation process occurred only in the Mg85Al15+V2O3 and Mg85Al15+V2O3@rGO samples. After the alloy was composited with V2O3@rGO, the apparent activation energy for hydrogen absorption/desorption decreased from 80.1 kJ mol(-1)/173.2 kJ mol(-1) to 61.6 kJ mol(-1)/91.3 kJ mol(-1), respectively. (C) 2019 Elsevier B.V. All rights reserved.