Ni-5%RE_xO_y复合添加剂对Mg_2Ni电化学储氢性能的影响  

Effects of Ni-5%RE_xO_y Composite Additives on Electrochemical Hydrogen Storage Performances of Mg_2Ni

作　　者：张国芳[1,2] 张羊换 许剑轶 侯忠辉[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古科技大学工业技术研究院,内蒙古包头014010

出　　处：《材料工程》2017年第11期72-77,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51501095);内蒙古自然科学基金资助项目(2017MS(LH)0516);内蒙古科技大学材料与冶金学院青年人才孵化器平台资助项目(2014CY012)

摘　　要：以Ni-5%RE_xO_y(CeO_2,La_2O_3,Eu_2O_3)为复合添加剂,研究添加剂对球磨Mg_2Ni合金的微观结构及电化学储氢性能的影响。结果表明:添加剂能够改变材料非晶与纳米晶结构的比例,复合材料的粒度分布均匀,但添加Ni-5%CeO_2的样品存在少量团聚现象。含有添加剂的样品具有更高的最大放电容量及更好的循环稳定性;添加剂均可有效提高复合材料的充放氢动力学性能,改善材料表面电荷转移能力及电化学反应的可逆性,提高合金内部H原子的扩散速率。其中Ni-5%CeO_2添加剂对提高复合材料动力学性能的催化效果最好。The Ni-5%RExOy（CeO2,La2O3,Eu2O3） as composite additives, Mg2Ni-Ni-5% RExOy composites were prepared by the ball milling method. The effects of different additives on the struc-ture ,morphology, electrochemistry and kinetic properties of Mg2Ni alloy were studied systematically. The results show that composite additives can improve the proportion of amorphous and nanocrystal-line structure of Mg2Ni alloy. The particle size is homogeneous but the agglomeration is observed in the sample with Ni-5 % Ce02 additives. The composites with additives show higher maximum dis-charge capacity and better cycle stabilities. All of these three kinds of composite additives can improve the kinetic properties of the composites effectively, including optimizing the charge-transfer ability, the reversibility of the electrochemical reaction on the alloy surface, and enhancing the diffusion coef-ficients of H atoms in the bulk of alloy. Among these three kinds of additives, Ni5 % Ce02 additive shows the best catalysis effect on promoting the kinetic properties of the composites.

关 键 词：稀土氧化物 MG2NI 电化学性能 动力学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]