摘要
本文系统地研究了Y元素对La1-xYxNi4.8Al0.2(x=0.6,0.7,0.8)储氢合金的晶体结构、吸放氢热力学、动力学和抗粉化性能的影响。研究结果表明,合金为CaCu5型六方结构,随着Y含量的增加,晶格参数a和晶胞体积V减小,而c几乎不变,c/a线性增大。随着Y含量的增加,合金吸放氢平台压显著升高;吸氢量略有减少;吸放氢平台斜率变小;滞后系数先减小后略增大,并与XRD(111)峰的半高宽FWHM值的变化有着很好的对应关系;抗粉化性能略有提高。当Y含量x=0.7时,合金的吸放氢动力学综合性能最好。
The influences of Y content on the crystal structure,hydrogen storage thermodynamics,kinetics and the pulverization resistance of La1-xYxNi4.8Al0.2（x=0.6,0.7,0.8）alloys were systematically investigated.The results showed that all the alloys had CaCu5 type hexagonal structure;with increasing Y content,the lattice parameter a and crystal volume V decreased,while the lattice parameter c kept nearly unchanged,and c/a increased linearly.With the increase of the Y substitution in the alloys,the absorption/desorption plateau pressure increased significantly;however,the hydrogen storage capacity decreased slightly;the plateau slopes declined;the hysteresis decreased first and then a little bit increased;there was a same variation trend of the hysteresis with the full width at half maximum of（111） XRD patterns;and the pulverization resistance slightly improved.The kinetics results showed that when the Y content x=0.7,the alloy showed an admirable performance in both the absorption and desorption kinetics.
出处
《金属功能材料》
CAS
2012年第1期1-7,共7页
Metallic Functional Materials
基金
国家自然科学基金50776094
国家"863"计划2006AA05Z135资助项目
关键词
氢能
储氢
金属氢化物
金属氢化物压缩机
hydrogen energy
hydrogen storage
metal hydride
metal hydride compressor
