Structure and electrochemical properties of (La_{1鈭?span style='font-style: italic'>x}Dy_x)_0.8Mg_0.2Ni_3.4Al_0.1 (x聽=聽0.0-0.20) hydrogen storage alloys

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• 作者：Beiping Wang^a ; ^b ; Yuanzhen Chen^a ; Yongning Liu^a ; ^{ynliu@mail.xjtu.edu.cn}
• 关键词：Hydrogen storage alloy ; Element substitution ; Structure characteristic ; Electrochemical property
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：11
• 页码：9082-9087
• 文件大小：871 K

摘要

The structure and electrochemical characteristics of (La_1鈭?em>xDy_x)_0.8Mg_0.2Ni_3.4Al_0.1 (x聽=聽0-0.20) hydrogen storage alloys have been investigated. Dysprosium was adopted as a partial substitution element for lanthanum in order to improve electrochemical properties. The XRD, SEM and EDX results showed that the alloys were composed of (La, Mg)₂Ni₇, LaNi₅ and (La, Mg)Ni₂ phases. The introduction of Dy promoted the formation of (La, Mg)₂Ni₇ phase which possesses high hydrogen storage capacity, and controlling dysprosium content at 0.05 can obtain the maximum (La, Mg)₂Ni₇ phase abundance in the alloys. The maximum discharge capacity was heightened from 382.5 to 390.2聽mAh/g, which was ascribed to (La, Mg)₂Ni₇ phase abundance increasing from 54.8%to a maximum (60.5%). Also, the biggest discharge capacity retention remained 82.7%after 100 cycles at discharge current density of 300聽mA/g.