Effect of CeH2.29 on the microstructures and hydrogen properties of LiBH4-Mg2NiH4 composites

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• 作者：Xin Zhao (1) (2)
  Shu-min Han (1) (2)
  Yuan Li (1)
  Xiao-cui Chen (1)
  Dan-dan Ke (1)
  
  1. Hebei Key Laboratory of Applied Chemistry ; College of Environmental and Chemical Engineering ; Yanshan University ; Qinhuangdao ; 066004 ; China
  2. State Key Laboratory of Metastable Materials Science and Technology ; Yanshan University ; Qinhuangdao ; 066004 ; P. R. China
  
• 关键词：hydrogen storage materials ; cerium hydride ; mechanical alloying ; microstructure
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：22
• 期：4
• 页码：423-428
• 全文大小：1,911 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

A composite of LiBH4-Mg2NiH4 doped with 10wt% CeH2.29 was prepared by ball milling followed by dynamic interspace vacuum treatment at 573 K. The introduction of CeH2.29 caused a transformation in the morphology of Mg from complex spongy and lamellar to uniformly spongy, resulting in refined particle size and abundant H diffusion pathways. This LiBH4-Mg2NiH4 + 10wt% CeH2.29 composite exhibited excellent hydrogen storage properties. The starting temperature of rapid H absorption decreased to 375 K in the doped composite from 452 K for the unmodified material, and the onset decomposition temperature of its hydride was reduced from 536 K to 517 K. In addition, the time required for a hydrogen release of 1.5wt% (at 598 K) was 87 s less than that of the un-doped composite.