Investigations on hydrogen storage properties of Mg₂Ni+x wt%LaMg₂Ni (x=0, 10, 20, 30) composites

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• 作者：Xin Zhao^a ; ^b ; Shumin Han^a ; ^b ; ^{hanshm@ysu.edu.cn} ; Xilin Zhu^b ; Baozhong Liu^a ; ^c ; Yanqing Liu^b
• 关键词：Hydrogen absorbing materials ; Mechanical alloying ; Microstructure ; Thermal analysis
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：June, 2012
• 卷：190
• 期：Complete
• 页码：68-72
• 文件大小：535 K

摘要

Mg₂Ni+x wt%LaMg₂Ni (x=0, 10, 20, 30) composites have been prepared by ball milling Mg₂Ni and LaMg₂Ni hydrides. X-ray Diffraction indicates that the composites consist of LaH₃ and Mg₂NiH₄ phases. Mg₂NiH₄ phase transforms between with Mg₂Ni phase during hydriding/dehydriding cycling, while the LaH₃ phase exists still after dehydriding process. Backscatter Electron results reveal that the LaH₃ phase, which is decomposed from hydrided LaMg₂Ni, distributes in Mg₂Ni alloy homogeneously after ball milling procedure. Hydriding/Dehydriding measurements indicate significant improvement in reversible hydrogen storage properties of the composites over Mg₂Ni at low temperature. At 473 K, the hydrogen storage capacity of Mg₂Ni+20 wt%LaMg₂Ni composite reaches 3.22 wt%and can reversely desorb hydrogen completely, while the pure Mg₂Ni hydride is hardly desorbs hydrogen at this temperature. The improvement in the hydrogen storage properties is attributed to the existence of LaH₃ phase in the composites.