Zhang Yanghuan, Wang Pengpeng, Bu Wengang, Yuan Zeming, Qi Yan, Guo Shihai
Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology Baotou 014010 China.
Department of Functional Material Research, Central Iron and Steel Research Institute Beijing 100081 China
RSC Adv. 2018 Jun 27;8(41):23353-23363. doi: 10.1039/c8ra03393e. eCollection 2018 Jun 21.
In this paper, ball milling was used to prepare CeMgNi + wt% Ni ( = 100, 200) alloys having nanocrystalline and amorphous structures. The structures of the alloys and their electrochemical and gaseous kinetic performances were systematically investigated. It was shown that the increase in Ni content was beneficial to the formation of nanocrystalline and amorphous structures, and it significantly enhanced the electrochemical and gaseous hydrogen storage performances of as-milled alloys. In addition, the hydrogen storage capacities of the alloys fluctuated greatly with variation in milling duration. The maximum values of hydrogen capacity detected by varying the milling durations were 5.949 wt% and 6.157 wt% for = 100 and 200 alloys, respectively. Similar results were observed for the hydriding rates and high-rate discharge abilities (HRD) of the as-milled alloys. The dehydriding rate increased with the increase in milling duration. The reduction in hydrogen desorption activation was the reason for enhanced gaseous hydrogen storage kinetics.
在本文中，采用球磨法制备了具有纳米晶和非晶结构的CeMgNi + wt% Ni（ = 100, 200）合金。系统研究了合金的结构及其电化学和气态动力学性能。结果表明，Ni含量的增加有利于纳米晶和非晶结构的形成，并显著提高了球磨态合金的电化学和气态储氢性能。此外，合金的储氢容量随球磨时间的变化波动很大。对于 = 100和200的合金，通过改变球磨时间检测到的最大储氢容量分别为5.949 wt%和6.157 wt%。球磨态合金的氢化率和高倍率放电能力（HRD）也观察到类似结果。脱氢速率随球磨时间的增加而增加。氢解吸活化能的降低是气态储氢动力学增强的原因。
