【摘要】 采用三步感应熔炼法制备了La_1-x Mg_xNi_4.25Al_0.75（x=0.0,0.1,0.2,0.3）储氢合金,研究了该系列合金的晶体结构和储氢性能。结果表明,当x为0.0和0.1时,合金由单一的La Ni4Al相组成;而x为0.2和0.3时,合金由La Ni4Al相,（La,Mg）Ni3相和AlN i3相构成。随着Mg含量x从0.2增至0.3时,合金的第二相丰度和吸/放氢平衡压明显升高,同时储氢容量减小。研究发现,当Mg添加量x=0.1时,合金除具有良好的储氢容量和低平台压外,其吸氢动力学性能更好。更多还原

【Abstract】 La_1-x Mg_xNi_4.25Al_0.75（x=0.0, 0.1, 0.2, 0.3） hydrogen storage alloys were prepared by a three-step induction melting. Their crystal structures and hydrogen storage properties were investigated. Results show that alloys with x=0.0 and 0.1 contain a single La Ni4 Al phase; however, those with x=0.2 and 0.3 are composed of La Ni4 Al,（La, Mg）Ni3 and AlN i3 phases. With x increasing from 0.2 to 0.3, the abundances of the secondary phases and the plateau pressures in the pressure-composition isotherms are lifted significantly. Meanwhile, their hydrogen storage capacities are remarkably reduced. It is found that the alloy with x=0.1 possesses the fastest absorption kinetics compared to the others as well as a good hydrogen capacity and a low plateau pressure.更多还原