快淬速率对(Mg70.6Ni29.4)92La8贮氢合金的微结构及电化学性能的影响

中国有色金属学报, 2010, 20(3): 516-521.

快淬速率对(Mg70.6Ni29.4)92La8贮氢合金的微结构及电化学性能的影响

黄林军 ^1, , 唐建国 ^2, , 周轶凡 ^3, , 王瑶 ^4, , 刘继宪 ^5, , 王蕊 ^6, , 黄震 ^7,

1.青岛大学,化学化工与环境学院,青岛,266071

2.青岛大学,化学化工与环境学院,青岛,266071

3.浙江大学,材料科学与工程学院,杭州,310027

4.青岛大学,化学化工与环境学院,青岛,266071

5.青岛大学,化学化工与环境学院,青岛,266071

6.青岛大学,化学化工与环境学院,青岛,266071

7.青岛大学,化学化工与环境学院,青岛,266071

基金项目: 山东省优秀中青年科学实科研奖励基金(BS2009CL039) 青岛大学校科研和教改项目(0814)

关键词： Mg-Ni-La系贮氢合金 , 微观结构 , 电化学性能 , 熔体快淬

Effects of melt-spinning velocity on microstructure and electrochemical properties of (Mg70.6Ni29.4)92La8 alloys

采用熔体快淬法制备(Mg70.6Ni29.4)92La8贮氢合金带,研究快淬速率对合金的微观组织结构及其电化学性能的影响.结果表明:随着快淬速率的加快,合金由纳米晶向非晶过渡,合金的非晶化程度增强,合金带的最大放电容量增加.冷却辊线速度为21.8 m/s制备的合金的循环最大放电容量可达568.5 mA-h/g,经过20次循环后,其最高容量保持率达79.3%;合金样品充电完成后形成的氢化物主要是Mg2NiH4,同时还保留大量的非晶结构.循环伏安测试结果显示较明显的氧化峰和还原峰,且峰电位差较小,反映电极合金具有较好的吸放氢反应的可逆性.

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