铸态及退火态La0.8-xPrxMg0.2Ni3.35Al0.1Si0.05(x=0～0.4)电极合金的电化学贮氢性能

稀有金属材料与工程, 2013, 42(10): 1981-1987.

铸态及退火态La0.8-xPrxMg0.2Ni3.35Al0.1Si0.05(x=0～0.4)电极合金的电化学贮氢性能

张羊换 ^1, , 蔡颖 ^2, , 李保卫 ^3, , 任慧平 ^4, , 侯忠辉 ^5, , 赵栋梁 ^6,

1.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010;钢铁研究总院,北京100081

2.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

3.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

4.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

5.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

6.钢铁研究总院,北京100081

基金项目: National Natural Science Foundations of China(51161015,50961009) Natural Science Foundation of Inner Mongolia,China(2011ZD10,2010ZD05) "863" Program(2011AA03A408)

关键词： A2B7型电极合金 , Pr置换La , 结构 , 电化学性质

Electrochemical Hydrogen Storage Characteristics of the as-Cast and Annealed La0.8-xPrxMg0.2Ni3.35Al0.1Si0.05(x=0～0.4) Electrode Alloys

Zhang Yanghuan ^1, , Cai Ying ^2, , Li Baowei ^3, , Ren Huiping ^4, , Hou Zhonghui ^5, , Zhao Dongliang ^6,

1.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010;钢铁研究总院,北京100081

2.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

3.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

4.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

5.内蒙古科技大学国家重点实验室培育基地,内蒙古包头014010

6.钢铁研究总院,北京100081

Keywords： A2B7-type electrode alloy , substitution of La with Pr , structure , electrochemical characteristics

采用铸造及退火工艺制备了La0.8-xPrxMg0.2Ni3.35Al0.1Si0.05 (x=0,0.1,0.2,0.3,0.4)电极合金.系统研究了Pr的替代对合金的结构与电化学储氢性质的影响,结果表明除少量残余LaNi3相外,铸造及退火合金是由六方Ce2Ni7型(La,Mg)2Ni7相与六方CaCu5型LaNi5相构成的.Pr对La的置换对合金的电化学储氢性质产生明显影响,铸造及退火合金的放电容量和高倍率放电能力随Pr含量的增加先升后降.当Pr含量由0增加至0.4时,铸造及退火合金的100次充放电循环后容积保持率S100从64.96％和72.82％分别增加至77.94％和91.81％.

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