AlH3 is a metastable state hydrogen storage compound, which has poor thermal stability and safety properties. In this paper, graphene oxide (GO) was used to prepare the GO@AlH3 hydrogen-storage composites through liquid phase self-assembly method. By means of the elemental analyzer, the H content of raw AlH3 and GO@AlH3 are detected. The microstructure, composition and thermal stability of GO@AlH3 are characterized by using of SEM, XRD, XPS, and DSC-TG. The effect of contents of GO on the thermal properties and safety properties of GO@AlH3, such as thermal decomposition, weight loss, friction sensitivity and impact sensitivity, was investigated systematically. Results show that the H content of GO@AlH3 is almost uniform with that of raw AlH3. The thermal stability and safety properties of GO@AlH3 are improved with the increase of mass fraction of GO in it. Optimum safety properties can be obtained in the sample of GO 0.2wt%, which exhibits a 35% loss of friction sensitivity and a 200% enhancement of impact sensitivity, respectively. The DSC exothermic peak shifts to high temperature and the weight loss before 170oC are remarkably reduced, which reveal the GO@AlH3 has better thermal stability. Thus, we pointed out that the proper approach to improve the thermal stability and safety properties of AlH3, providing a new technical basis for its application research in the hydrogen storage field and energetic materials.

AlH3 is a metastable state hydrogen storage compound, which has poor thermal stability and safety properties. In this paper, graphene oxide (GO) was used to prepare the GO@AlH3 hydrogen-storage composites through liquid phase self-assembly method. By means of the elemental analyzer, the H content of raw AlH3 and GO@AlH3 are detected. The microstructure, composition and thermal stability of GO@AlH3 are characterized by using of SEM, XRD, XPS, and DSC-TG. The effect of contents of GO on the thermal properties and safety properties of GO@AlH3, such as thermal decomposition, weight loss, friction sensitivity and impact sensitivity, was investigated systematically. Results show that the H content of GO@AlH3 is almost uniform with that of raw AlH3. The thermal stability and safety properties of GO@AlH3 are improved with the increase of mass fraction of GO in it. Optimum safety properties can be obtained in the sample of GO 0.2wt%, which exhibits a 35% loss of friction sensitivity and a 200% enhancement of impact sensitivity, respectively. The DSC exothermic peak shifts to high temperature and the weight loss before 170oC are remarkably reduced, which reveal the GO@AlH3 has better thermal stability. Thus, we pointed out that the proper approach to improve the thermal stability and safety properties of AlH3, providing a new technical basis for its application research in the hydrogen storage field and energetic materials.