Synthesis of Mg-based composite material with in-situ formed LaH_3 and its hydrogen storage characteristics  

作　　者：Jiasheng Wang Yuan Li Ting Liu DANDan Peng Shumin Han 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University [2]Department of Environmental Engineering,North China Institute of Science and Technology [3]Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University

出　　处：《Journal of Rare Earths》2018年第7期739-744,共6页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51771164,51571173);China Postdoctoral Science Foundation(2016M601281);Scientific Research Projects in Colleges and Universities in Hebei Province,China(ZD2014004,QN2016002)

摘　　要：In this work,a Mg-based composite material with in-situ formed LaH3, Mg2 NiH4-LiBH4 ＋ 20 wt% LaH3,was prepared by ball milling LiBH4 and hydrogenated LaMg2 Ni and Mg2 Ni powder mixture, followed by heat treatment at 573 K. The onset dehydrogenation temperature of the composite is reduced by 50 K compared with that of Mg2 NiH4-LiBH4. The LaH3-doped composite shows faster kinetics,absorbing1.43 wt% hydrogen within 100 s at 423 K,which is 6.5 times faster than Mg2 NiH4-LiBH4. Moreover,the composite releases 1.24 wt% hydrogen within 500 s at 573 K,0.69 wt% higher than Mg2 NiH4-LiBH4. The activation energy of the composite is reduced by 8.2 and 80 kJ/mol compared with that of Mg2 NiH4-LiBH4 and commercial MgH2, respectively. The improvement in hydrogen storage properties is attributed to the fact that LaH3 promotes the generation of nano-sized spongy Mg structure, which has good catalytic activity during the subsequent hydrogenation/dehydrogenation process.In this work,a Mg-based composite material with in-situ formed LaH3, Mg2 NiH4-LiBH4 ＋ 20 wt% LaH3,was prepared by ball milling LiBH4 and hydrogenated LaMg2 Ni and Mg2 Ni powder mixture, followed by heat treatment at 573 K. The onset dehydrogenation temperature of the composite is reduced by 50 K compared with that of Mg2 NiH4-LiBH4. The LaH3-doped composite shows faster kinetics,absorbing1.43 wt% hydrogen within 100 s at 423 K,which is 6.5 times faster than Mg2 NiH4-LiBH4. Moreover,the composite releases 1.24 wt% hydrogen within 500 s at 573 K,0.69 wt% higher than Mg2 NiH4-LiBH4. The activation energy of the composite is reduced by 8.2 and 80 kJ/mol compared with that of Mg2 NiH4-LiBH4 and commercial MgH2, respectively. The improvement in hydrogen storage properties is attributed to the fact that LaH3 promotes the generation of nano-sized spongy Mg structure, which has good catalytic activity during the subsequent hydrogenation/dehydrogenation process.

关 键 词：MG2NIH4 LiBH4 Composite Hydrogen storage properties Lanthanum hydride Rare earths 

分 类 号：TB34[一般工业技术—材料科学与工程]