Effect of LaH₃-TiH₂ composite additive on the hydrogen storage properties of Mg₂Ni alloys

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• 作者：Xin Zhao ; Shumin Han ; Xilin Zhu ; Baozhong Liu ; Xiaocui Chen ; Yanqing Liu ; Ruibing Wang
• 关键词：Hydrogen storage ; Mechanical alloying ; Microstructure ; Kinetic properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 December, 2013
• 年：2013
• 卷：581
• 期：Complete
• 页码：270-274
• 全文大小：880 K

文摘

A novel LaH₃-TiH₂ composite additive was prepared by ball milling LaH₃ and TiH₂ at a 1:1 weight ratio. Kinetic measurements on the hydrogenation reaction indicated that the LaH₃-TiH₂ composite additive could significantly improve the hydrogen absorption properties of Mg₂Ni. In comparison with that of a pure Mg₂Ni alloy and a composite material combining Mg₂Ni + 10 wt. % LaH₃, the hydrogen storage capacity of the Mg₂Ni + 10 wt. % (LaH₃-TiH₂) composite was 0.251 wt. % and 0.559 wt. % higher at 423 K within 100 s, respectively. Moreover, the composite additive revealed an excellent effect on ameliorating the thermodynamic properties of the Mg₂Ni hydride. The decomposition onset temperature of the Mg₂Ni + 10 wt. % (LaH₃-TiH₂) composite hydride was 17 and 13 K lower than that of the pure Mg₂NiH₄ and Mg₂Ni + 10 wt. % TiH₂ composite, respectively. X-ray diffraction (XRD) results indicated that the LaH₃ in the LaH₃-TiH₂ composite additive were converted to LaH₂ by the catalytic effect of TiH₂ during the hydrogenation cycles and that the process enhanced the kinetic properties of hydrogen storage for Mg₂Ni alloy.