Fe替代Co对AB_5型贮氢合金电化学性能和相结构的影响  

The Influence of the Substitution Fe for Co on the Electrochemical Properties and Phase-structure of AB_5-type Hydrogen Storage Alloys

作　　者：王国清[1] 张羊换[1] 赵栋梁[1] 韩晓英[1] 郭世海[1] 王新林[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《金属功能材料》2006年第1期4-7,共4页Metallic Functional Materials

基　　金：国家自然科学基金重点项目(50131040);内蒙古自然科学基金资助项目(200408020706)

摘　　要：研究了Fe替代Co对Mm(NiMnSiAl)4.3Co0.6-xFex(x=0,0.2,0.4,0.6)贮氢合金电化学性能和相结构的影响。研究结果表明:Fe替代Co使合金的放电容量降低,但使合金的循环稳定性得到改善;合金具有双相结构,主相为CaCu5型相,还有少量的第二相Ce2Ni7相,随着Fe替代量的增加,第二相没有明显变化,但合金的点阵常数和晶胞体积略有增加,这是Fe替代Co使合金循环稳定性得以改善的一个主要原因。The influence of substitution Fe for Co on the electrochemical properties and phase-structure of Mm（NiMnSiAl）4.3Co0.6-xFex（x=0,0.2,0.4,0.6） hydrogen storage alloys was investigated. The results show that the substitution Fe for Co decreases the discharge capacity, however, improves the cycle stability of the alloys. All alloys have twophase structures, the main phase is CaCus-type phase and the second phase is Ce2Nb, the content of Fe has little notable effect on the second phase, but makes the lattice constant and cell volume increase, this is regarded as one of the main reasons that the substitution Fe for Co improves the cycle stability of the alloys.

关 键 词：AB5型贮氢合金 电化学性能 相结构 

分 类 号：TM910.4[电气工程—电力电子与电力传动]