Cycling performance of La(Nib>3.8b>Alb>1.0b>Mnb>0.2b>)b>xb> (x = 0.94-1.0) alloys

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• 作者：S.L. Li^a ; ^b ; ^{lishenlancn@163.com} ; W. Chen^b ; G. Luo^b ; X.B. Han^b ; D.M. Chen^b ; K. Yang^b ; W.P. Chen^a
• 关键词：Hydrogen absorption/desorption cycling property ; AB5 type hydrogen storage alloy ; Surface morphology
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 August, 2012
• 卷：532
• 期：Complete
• 页码：68-71
• 文件大小：669 K

摘要

The effects of hydrogen absorption/desorption cycling on the hydrogen storage capacity, plateau pressure, pulverization resistance and surface morphologies of La(Nib>3.8b>Alb>1.0b>Mnb>0.2b>)b>xb> (x = 0.94, 0.96, 0.98, 1.0) alloys were investigated. It was found that the investigated alloys subjected to 300 absorption/desorption cycles did not exhibit significant changes in hydrogen storage capacity. The plateau region was relatively flat and there was no obvious hysteresis loss after 300 cycles. The mean particle sizes for the three non-stoichiometric alloys were much larger than that of LaNib>3.8b>Alb>1.0b>Mnb>0.2b> alloy. X-ray diffraction profiles revealed that the La(Nib>3.8b>Alb>1.0b>Mnb>0.2b>)b>xb> alloys after initial activation showed a significant peak broadening but this broadening did not last with the following cycling. The pulverized particle of the La(Nib>3.8b>Alb>1.0b>Mnb>0.2b>)b>xb> alloys only presented cleaved surfaces, indicating that the pulverization mainly resulted from brittle fracture. The changes in hydrogen absorption/desorption properties induced by cycling were discussed by considering the peak broadening, lattice strain, defects and surface morphology.