Highly improved hydrogen storage capacity and kinetics of the nanocrystalline and amorphous PrMg12-type alloys by mechanical milling

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Zhang, Y.H.^1,2 ; Shang, H.W.^2 ; Li, Y.Q.^2 ; Yuan, Z.M.^2 ; Yang, T.^2 ; Zhao, D.L.^2

Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou

014010, China^1

Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing

100081, China^2

关键词: Electrochemical discharge capacities;    High rate discharge ability;    Hydrogen desorption;    Hydrogen storage capacities;    Hydrogenation rate;    Kissinger methods;    Mechanical milling;    Nanocrystalline and amorphous;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012004/pdf
DOI  :  10.1088/1742-6596/52/1/012004

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Nanocrystalline and amorphous PrMg11Ni + x wt.% Ni (x = 100, 200) alloys were synthesized by mechanical milling. Effects of Ni content and milling duration on the structures, hydrogen storage capacity and kinetics of the as-milled alloys were investigated systematically. The structures were characterized by XRD and HRTEM. The hydrogen desorption activation energy was calculated by using Kissinger method. The results show that increasing Ni content dramatically improves the electrochemical discharge capacity of the as-milled alloys. Furthermore, the variation of milling time has a significant impact on the kinetics of the alloys. As the milling time increased, the high-rate discharge ability (HRD), gaseous hydrogen absorption capacity and hydrogenation rate increased at first but decreased finally, while the dehydrogenation rate always increased.