CeMn_(1-x)Al_(1-x)Ni_(2x)(x=0.00,0.25,0.50和0.75)合金的结构和电化学性能研究  

Structure and Electrochemical Characteristics of CeMn_(1-x)Al_(1-x)Ni_(2x) (x=0.00,0.25,0.50 and 0.75) Alloys

作　　者：侯春平[1] 赵敏寿[1] 乔玉卿[1] 李佳[1] 黄亮[1] 朱新坚[2] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]上海交通大学燃料电池研究室,上海200030

出　　处：《中国稀土学报》2007年第1期115-119,共5页Journal of the Chinese Society of Rare Earths

基　　金：中国科学院稀土化学与物理重点实验室基金资助

摘　　要：研究了镍部分取代AB2型CeMnAl金属间化合物B侧Mn,Al形成的化学计量比合金的结构和电化学性能。XRD分析,SEM形貌观察和电化学性能测试结果表明:镍的部分取代使合金发生了相变化,形成了新相,CeMn1-xAl1-xNi2x(x=0.0,0.25,0.50和0.75)合金电极的电化学活性得到很大提高,298K时的放电容量从x=0时的17.93mAh.g-1提高到x=0.75时的118.3mAh.g-1,328 K时的放电容量从x=0时的68.42mAh.g-1提高到x=0.75时的216.1mAh.g-1。合金的电化学P-C-T曲线表明:无Ni的CeMnAl合金几乎没有平衡氢压平台,随Ni取代量的增加,合金的平衡氢压平台斜率变小,宽度增大。The structure and electrochemical characteristics of Ni substitution for Mn and Al in AB2-typo CeMnAI intermetallic compounds were studied. XRD and SEM reveal that Ni partial substitution leads to a phase change of the alloys and new phase formed. The electrochemical activity of CeMn1- x Al1- x Ni2x （ x = 0.00, 0.25, 0.50 and 0.75） alloys is greatly im- proved and the discharge capacity can increase from 17.93 mAh·g^-1（x =0.00） to 118.3 mAh·g^-1 （x = 0.75） at 298 K and from 68.42 mAh·g^-1（x = 0.00） to 216.1 mAh·g^-1（x = 0.75） at 328 K, respectively. The eleetroehemieal P-C-T eurves show that no hydrogen equilibrium pressure plateau is observed for CeMnAl alloy while the slope of the plateau becomes flatter and longer with increasing Ni content.

关 键 词：贮氢合金 电化学性能 MH-NI电池 LAVES相 

分 类 号：TG146.4[一般工业技术—材料科学与工程]