| Mg-based hydrogen storage material is very promising for hydrogen storage and heat storage application because of its thermal capacity and heat effect. But in fact, the pure Mg is rarely considered for practical applications because of the poor hydriding and dehydriding properties. Therefore, the Mg-3Ni-2MnO2 is fabricated by ball milling under hydrogen atmosphere, and the hydrogen storage properties are investigated systematically. A prototype system for application is developed on the base of this research.The intrinsic absorption and desorption kinetics properties of Mg-3Ni-2MnO2 hydrogen storage materials with an average particle size of about 1.1μm is measured systematically. The results show that the Mg-3Ni-2MnO2 hydrogen storage materials have excellent intrinsic hydrogen storage properties, and that the temperature and pressure do not change the phase transformation rule, though they have effect on hydrogen storage properties and phase transformation velocity. The inlet pressure,initial temperature and porosity have an effect on the accumulated absorption kinetics, and the initial temperature and porosity play an important role in the desorption too. Compared with the intrinsic hydrogen desorption properties, the lower the initial temperature of the reaction bed is, the faster the absorption rate is.The big capacity heat and hydrogen storage apparatus has been designed and hydrogen storage properties are measured by the hydrogen storage properties and heat effect on the reaction bed. The results show that the heat and hydrogen storage apparatus finished hydrogen absorption in 240 minutes, and the desorption rate of heat is correlative with the absorption rate of hydrogen; it finished hydrogen desorption in 400 minutes; the inlet pressure has an effect on the hydrogen absorption kinetics, and the bed temperature effects the hydrogen desorption kinetics; the heat and hydrogen storage apparatus can improve the efficiency of energy utilization to some extent.
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