MNi_(4.8)Sn_(0.2)(M=La, Nd)-supported multi-walled carbon nanotube composites as hydrogen storage materials  

作　　者：REN JianWei LIAO ShiJun LIU JunMin 

机构地区：[1]College of Chemistry, South China University of Technology, Guangzhou 510641, China

出　　处：《Chinese Science Bulletin》2007年第12期1616-1622,共7页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20476034);Guangdong Provincial Scientific Foundation

摘　　要：Two composites LaNi4.8Sn0.2/CNTs and NdNi4.8Sn0.2/CNTs were prepared by an impregnation-reduction method. Their hydrogen storage capacity could reach up to 2.96 wt% and 2.88 wt% respectively at room temperature and 1.0 MPa pressure. These values, which might result from the synergetic effect between the alloy nanoparticles and the pretreated CNTs, were three times higher than those of the unsupported MNi4.8Sn0.2 (M=La, Nd) alloys under the same conditions. XRD and TEM revealed that the alloy particles were uniformly dispersed on the CNTs and the average particle size was ca. 30 nm. The composites also showed good stability and the hydrogen storage capacity decreased by less than 6% after 100 adsorption-desorption cycles. Moreover, no noticeable change in crystalline structure was observed for the composites.Two composites LaNi4.8Sn0.2/CNTs and NdNi4.8Sn0.2/CNTs were prepared by an impregnation-reduction method. Their hydrogen storage capacity could reach up to 2.96 wt% and 2.88 wt% respectively at room temperature and 1.0 MPa pressure. These values, which might result from the synergetic effect between the alloy nanoparticles and the pretreated CNTs, were three times higher than those of the unsupported MNi4.8Sn0.2 （M=La, Nd）alloys under the same conditions. XRD and TEM revealed that the alloy particles were uniformly dispersed on the CNTs and the average particle size was ca. 30 nm. The composites also showed good stability and the hydrogen storage capacity decreased by less than 6% after 100 adsorption-desorption cycles. Moreover, no noticeable change in crystalline structure was observed for the composites.

关 键 词：储氢材料 碳纳米管 稀土金属元素 镍 锡 

分 类 号：TB383[一般工业技术—材料科学与工程] TG139.7[金属学及工艺—合金]