铸态及快淬态CeMg10Ni2合金电化学储氢热力学及动力学性能研究  

Investigations in Electrochemical Thermodynamic and Kinetic Properties of As-Cast and As-Quenched CeMg10Ni2 Hydrogen Storage Alloys

作　　者：胡锋[1,2] 罗丽容 李永治 翟亭亭[2] 赵鑫 张羊换[1,2] HU Feng;LUO Li-rong;LI Yong-zhi;ZHAI Ting-ting;ZHAO Xin;ZHANG Yang-huan(Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China;The School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]内蒙古科技大学材料与冶金学院,内蒙古自治区包头014010

出　　处：《电化学》2019年第5期631-638,共8页Journal of Electrochemistry

基　　金：国家自然科学基金(No.51761032和51871125);内蒙古自然科学基金(No.2017BS0507和No.2018LH05010);内蒙古科技成果转化项目(No.CGZH2018152);内蒙古科技大学创新基金项目(No.2014QDL015)

摘　　要：为了改善CeMg10Ni2合金的电化学储氢性能,快淬技术被用来制备具有非晶纳米晶结构的CeMg10Ni2合金.运用X射线衍射及高分辨透射电镜对合金的微观结构及其相组成进行分析.通过恒电流充放电、高倍率放电、交流阻抗以及动电位极化测试对合金的电化学性能进行了详细研究.研究结果表明,铸态合金由多相结构组成,经过快速凝固处理的合金内部含有大量的非晶纳米晶结构,而且增加的凝固速度可以增强合金内部的非晶纳米晶形成能力.快速凝固处理减小了合金的热力学参数(△H和△S),降低了合金氢化物的热稳定性,改善了电化学放电容量.另外,快速凝固处理显著改善了合金的电化学动力学性能,合金的表观活化能变化进一步解释了这一结论.In order to improve the electrochemical hydrogen storage properties of CeMg10Ni2 alloy,the rapid quenching technology was used to prepare CeMg10Ni2 alloys with nano-crystalline and amorphous structure.The microstructures of as-cast and as-spinning sample were characterized by X-ray diffraction(XRD)and transmission electron microscopy(TEM).The electrochemical hydrogen storage properties were investigated by an automatic galvanostatic charging/discharging,high rate discharging(HRD),electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization techniques.The results revealed that the as-cast alloy was composed of multiphase structures.The as-quenched alloys were made up of nano-crystalline and/or amorphous structures,and the rapid solidification technology enhanced the glass forming ability of alloys.The rapid spinning technology brought on a reduction in thermodynamic parameters(ΔH andΔS),which lowered the stability of hydride and ameliorated the discharging capacity of alloy sample.Besides,the as-quenched alloys held better electrochemical kinetics,which may be interpreted by the variation of activation energy.

关 键 词：快速凝固 非晶纳米晶 放电容量 电化学动力学 活化能 

分 类 号：O646.5[理学—物理化学] TG139[理学—化学]