纳米TiO_2对Mg-15%Mg_2Ni复相合金吸放氢性能的影响  

EFFECT OF TiO2 NANOPARTICLES ON THE HYDRIDING AND DEHYDRIDING PROPERTIES OF Mg-15wt%Mg2Ni COMPOSITES

作　　者：高嵘岗[1] 涂江平[1] 王秀丽[1] 张孝彬[1] 陈长聘[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《太阳能学报》2004年第1期52-55,共4页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究规划项目(TG20000246-06);国家高技术研究发展计划(863计划)项目(2003AA302420)

摘　　要：用扩散烧结制备Mg2Ni合金,然后与Mg粉和不同比例(质量百分比分别为0.5％,1.5％,2.5％)的纳米TiO2混和球磨得到纳米。Mg-Mg2Ni-TiO2复合储氢材料。对复相合金进行储氢性能研究时发现,其中添加0.5％TiO2的试样可以在393K,4MPa的条件下4min内吸氢,并能在503K,0.1MPa条件下15min内放氢,放氢量为4.1％;随着温度升高,复合储氢材料放氢量和放氢速度得到提高,在473K吸氢和503K放氢条件下,合金在15min内的放氢量达到5.6％。纳米TiO2对合金吸放氢动力学性能有促进作用。复合储氢材料中增加TiO2含量,加快了放氢速度,略微降低了放氢量。A kind of composite was prepared by ball-milling Mg-15wt% Mg2Ni alloy with different contents (0, 0.5wt%, 1.5wt%, 2.5wt%) of TiO2 (anatase) nanoparticles. XRD results show that nanocrystalline alloy with the size of about 40 nm is obtained. The composite containing 0.5wt% TiO2 nanoparticles can absorb hydrogen at 393 K under the pressure of 4 MPa in 4 min and can desorb hydrogen at 503 K under 0.1 MPa in 15 min. The capacity of the dehydrogenation is 4.1wt%. With increasing the temperature, the dehydrogenation capacity and the kinetics of the dehydriding are increased. After hydrogenation at 473 K, the Mg-15wt% Mg2Ni-0.5wt%TiO2 composite can desorb 5.6wt% hydrogen at 523 K in 15 min. The TiO2 nanoparticles can improve the hydriding and dehydriding properties of the composites. As content of the TiO2 nanoparticles increases, the speed of the dehydriding increases but the decrease in de-hydrogenation capacity is small.

关 键 词：复合储氢材料 Mg MG2NI 纳米TiO2 

分 类 号：TG139.7[一般工业技术—材料科学与工程]