摘要
用双辊快淬法制备了纳米晶稀土贮氢合金,XRD图谱表征为结晶较好的CaCu5六方结构,Scherrer公式计算晶粒大小约为40nm。利用循环伏安法测定了纳米晶稀土贮氢合金电极中的氢扩散系数(DH=1.67×10-7cm2/s),由于纳米晶粒具有较高的结晶度和细小的晶粒尺寸,高密度晶界为氢在合金内部的扩散提供快速通道,提高了贮氢合金的吸放氢效率,从而提高了氢的扩散性能,使电极中氢的扩散系数增大。
Nanocrystalline rare earth hydrogen storage alloyhas been prepared by double-roller rapid quenching method.The alloy is of CuCa5 hexagonal structure with crystal size about 40 nm determined by Scherrer formula.Cyclic voltammetry was used to determine the hydrogen diffusion coefficient（DH=1.67×10^-7 cm^2/s） of the alloy.The nanocrystalline has high degree of crystallinity,small crystal particle size and high-density grain boundaries which provide a fast diffusion spread channel for hydrogen atoms to transport,and thus enhance the absorption and desorption of hydrogen.
出处
《稀土》
EI
CAS
CSCD
北大核心
2010年第1期23-25,共3页
Chinese Rare Earths
基金
广东省金属材料公共实验室开放课题
关键词
纳米晶
贮氢合金
氢扩散系数
循环伏安法
nanocrystalline
hydrogen storage alloy
hydrogen diffusion coefficient
cyclic voltammetry
