Fe部分取代Co对La_(0.7)Zr_(0.1)Mg_(0.2)Ni_(2.75)Co_(0.75-x)Fe_x(x=0,0.05,0.1,0.15,0.2)合金储氢性能的影响  

Effect of Partial Substitution of Fe for Co on the Hydrogen Storage Performance of La_(0.7)Zr_(0.1)Mg_(0.2)Ni_(2.75)Co_(0.75-x)Fe_x(x=0,0.05,0.1,0.15,0.2) Alloys

作　　者：彭雯琦[1] 戴豪 邓年进[1] 卢照[1] 蓝志强[1] 郭进[1] 

机构地区：[1]广西大学物理科学与工程技术学院,南宁530004

出　　处：《材料导报》2014年第2期25-29,33,共6页Materials Reports

基　　金：国家自然科学基金(51271061);广西理工中心重点项目(LGZX201202);广西有色金属及特色材料加工重点实验室项目

摘　　要：在氩气保护下,采用磁悬浮感应熔炼方法制备La0.7Zr0.1Mg0.2Ni2.75Co0.75-x Fex(x=0,0.05,0.1,0.15,0.2)合金,并研究Fe取代Co对La0.7Zr0.1Mg0.2Ni2.75Co0.75-x Fex(x=0,0.05,0.1,0.15,0.2)合金储氢性能及电化学性能的影响。结果表明:合金主要由LaNi5和La2Ni7相组成,随着Fe含量的增加,LaNi5和La2Ni7相的晶胞体积逐渐增大,且合金中依次出现ZrFe2相(x≥0.05)和La7Ni3相(x≥0.1)。适量的Fe取代Co,不仅能提高La0.7Zr0.1-Mg0.2Ni2.75Co0.75-x Fex(x=0,0.05,0.1,0.15,0.2)合金的储氢容量,降低合金的放氢平台压,改善合金氢化物的稳定性,而且能延长合金电极的循环寿命,提高合金电极的高倍率放电性能。La0.7Zr0.1Mg0.2Ni2.nCo0.75 xFex（x=0,0.05,0.1,0.15,0.2） alloys were prepared by magnetic levitation melting under an argon atmosphere,and the effects of partial substitution of Fe for Co on the alloys＇ hydrogen storage property and electrochemical performance were investigated.The results show that the samples mainly contain LaNi5 and La2 Ni7 phases whose cell volume gradually increases with Fe content increasing.ZrFe2 and La7 Ni3 appear as x≥0.05 and x≥0.1,respectively.For La0.7 Zr0.1 Mg0.2 Ni2.75 Co0.75-x Fex （x =0,0.05,0.1,0.15,0.2） alloys,the addition of Fe not only increases hydrogen storage capacity,decreases hydrogen desorption plateau pressure and improves hydride stability,but also significantly prolongs cycle life and enhances high rate dischargeability.

关 键 词：La-Mg-Ni基合金 储氢性能 循环稳定性 放氢平台压 容量保持率 高倍率放电性能 氢扩散系数 

分 类 号：TG139.7[一般工业技术—材料科学与工程]