中文摘要：

为研究稀土元素Ce、Y对非晶储氢合金催化及其性能的影响,采用快淬法制备Mg70（A0.25Ni0.75）30（A=Ce,Y）合金,使用Sievert’s气体吸附技术和差示热扫描技术研究其储氢性能和热力学稳定性。XRD衍射分析显示,快淬制备的合金为非晶合金,但在573K、2MPa的氢压下,氢化后的Mg70（Y0.25Ni0.75）30会产生MgH2、Mg2NiH4和2相,Mg70（Ce0.25Ni0.75）30会产生Mg2NiH4、CeNi5和MgH2相。不同温度的动力学测试结果表明,快淬法制备的Mg70-（Ce0.25Ni0.75）30和Mg70（Y0.25Ni0.75）30合金分别获得的最大吸氢量为质量分数4.42%和3.09%,Mg70（Ce0.25Ni0.75）30和Mg70（Y0.25Ni0.75）30合金前100s吸氢量分别达到各自最大吸氢量的97%和87%。通过对DSC曲线的分析发现,Mg70（A0.25Ni0.75）30的脱氢活化能较低,分别为111.025±2.790kJ/mol（A=Ce）、84.843±2.057kJ/mol（A=Y）和152.207±6.764kJ/mol（A=Y）。实验结果表明,Y元素对Mg70（A0.25Ni0.75）30合金催化及储氢性能的改善要优于Ce元素。

英文摘要：

In order to research rare earth elements（Ce, Y） catalytic and hydrogen storage properties on the amorphous alloy, amorphous Mg70（A0.25Ni0.75）30（A= Ce, Y） alloys were produced by melt spinning. The hydrogen storage properties and the thermal stabilities were studied by means of Sievert＇s and differential scanning calorimetry（DSC） respectively. XRD shows that the alloys produced by melt spinning were amorphous. After hydrogenation of Mg70（A0.25Ni0.75）30 sample at 573 K under 2 MPa hydrogen pressure, XRD results indicate the new phases of MgH2, Mg2 NiH4, YHz are formed in MgTo （Yo.zs Nio.Ts ）30, while the new phases of Mg2NiH4, CeNi5 and MgH2 are also formed in Mg70（A0.25Ni0.75）30. The kinetics curves in the different temperatures show the maximum hydrogen absorption capacity is 4.42% for Mg70（A0.25Ni0.75）30 and the maximum hydrogen absorption capacity is 3.09% for Mg70（A0.25Ni0.75）30.Mg70（A0.25Ni0.75）30 and Mg70（A0.25Ni0.75）30achieve 97% and 87% of their maximum hydrogen contents respectively in the first 100 s. Based on DSC analysis, dehydrogenation activation energies of these samples are relatively lower. The Mg70（A0.25Ni0.75）30 determine to be 111. 025-1-2. 790 kJ/mol. The Mg70（A0.25Ni0.75）30 determine to be 84. 843±2. 057 kJ/mol and 152. 207±6. 764 kJ/mol. Experimental results show that the Y element can improve the performance of catalytic effect and hydrogen storage properties better than the Ce element.