新型复合材料Mg/MWNTs的储放氢性能  

Hydrogen adsorption/desorption property of advanced composite Mg/MWNTs

作　　者：陈东[1] 陈廉[1] 刘实[1] 陈德敏[1] 成会明[1] 马常祥[2] 王隆保[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]东北大学理学院,沈阳110006

出　　处：《中国有色金属学报》2003年第4期850-853,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划项目(G2000026403);国家自然科学基金重点资助项目(50131050)

摘　　要：通过在加氢气氛下高能球磨,制成了新型复合材料Mg/MWNTs。利用XRD,TEM SAED等手段对该材料进行了微结构分析。采用储放氢实验装置测试了Mg/MWNTs H2体系的PCT放氢曲线和放氢动力学性能。研究发现:复合材料Mg/MWNTs在2.0MPa氢压时,373,473,553和598K温度下,最大储氢量(质量分数)分别为0.41%,3.37%,5.70%和6.25%;复合材料Mg/MWNTs氢化物的焓变和熵变的绝对值均低于纯Mg,分别降低了10.51%和3.50%;与纳米晶Mg氢化物相比,复合材料Mg/MWNTs不仅最大储氢量显著增加,而且放氢动力学性能也明显改善。The advanced composite Mg/MWNTs was made by high energy ballmilling under the hydrogen atmosphere. The microstructure was characterized by using XRD, TEM and SAED techniques. The hydrogen desorption PCT curves and the hydriding/dehydriding kinetics for the composite Mg/MWNTsH system were examined by taking the apparatus for hydrogen adsorption/desorption. It is found that the maximum hydrogen storage capacities are 0.41%, 3.37%, 5.70% and 6.25% at temperature of 373, 473, 553 and 598 K under 2.0 MPa hydrogen pressure respectively. The absolute values of enthalpy variable and entropy variable for the composite Mg/MWNTs hydride are lower about 10.51% and 3.50% than that of pure Mg. Compared with the nanocrystalline Mg hydride, not only the maximum hydrogen storage capacity of the composite is greatly increased, but also the desorption kinetics property of the composite is significantly improved.

关 键 词：Mg/MWNTs 储放氢性能 复合材料 最大储氢量 氢化物 放氢动力学 

分 类 号：TG139.7[一般工业技术—材料科学与工程]