微波法制备Mg_2NiH_4氢化物及其性能  

Preparation of Mg_2iH_4 by Microwave Processing and Its Properties

作　　者：刘杨[1] 李谦[1] 刘静[1] 张旭[1] 赵云鹤[1] 周国治[1,2] 

机构地区：[1]上海大学材料学院现代冶金与材料制备重点实验室 [2]北京科技大学物理化学系,北京100083

出　　处：《材料导报》2007年第S2期77-80,共4页Materials Reports

基　　金：上海市基础研究重点项目(05JC14064;06JC14031);上海市青年科技启明星计划(06QA14021);上海市教育委员会科研项目(06AZ001)

摘　　要：采用微波法制备了Mg2NiH4氢化物,并对其热力学和动力学进行了研究,该材料具有很好的动力学性能、较好的循环稳定性和较高的储氢量。在H2压力3.0MPa和250℃下,50s以内,储氢量达到3.20%(质量分数)。在H2压力3.0MPa和200～300℃的条件下,可以在20～40s内完成饱和吸氢量的90%以上。采用XRD和SEM对材料的物相结构和形貌特征进行研究,实验证明:物相组成由最初的单质Mg、Ni变为Mg2NiH4。同未经微波作用的试样对比发现,微波作用使产物的吸氢动力学性能得到明显改善。The Mg2NiH4 is prepared by microwave synthesis (MS), and its thermodynamic and kinetic properties are examined. Under 3.0 MPa hydrogen pressure and within 50,the materials possesses high hydrogen storage capacity of 3.2 wt% at 250℃. Under 3.0 MPa hydrogen pressure, the alloy can absorb more than 90% of its full hydrogen capacity in about 20～40s at 200～300℃. XRD and SEM are used to characterize the crystal structure, microstructures, and composition of the composite samples. It is found that through the MS the samples phase changed from original Mg and Ni to Mg2NiH4. The hydrogen adsorption kinetics of the MS samples is evidently enhanced, as a result of the activation effects of the microwave field.

关 键 词：储氢材料 微波法 Mg₂NiH₄ 热力学 动力学 

分 类 号：TB34[一般工业技术—材料科学与工程]