氢气储存
氢
氢化物
解吸
动力学
吸附低温
催化作用
活化能
化学
吸收(声学)
材料科学
无机化学
化学工程
吸附
物理化学
有机化学
复合材料
物理
量子力学
工程类
作者
Chen Jin,Haoyuan Zheng,Li Wang,Haizhen Liu,Xinhua Wang,Mi Yan
标识
DOI:10.1016/j.jallcom.2023.172247
摘要
Because Mg(NH2)2-2LiH system has a high hydrogen storage capacity and a mild hydrogen release temperature around 125 °C, it can be used as a new generation of on-board hydrogen storage material, but the hydrogen absorption and release kinetics still have great obstacles. In this paper, CeH2.51, a rare earth hydride, was used as a modified catalyst to improve its hydrogen storage performance for the first time. The experimental results showed that the addition of CeH2.51 can significantly improve the hydrogen absorption/desorption kinetics and cycle performance compared with that of the pristine sample Mg(NH2)2-2LiH. And the sample doped with 7.5 wt% CeH2.51 shows the best comprehensive performance. The initial hydrogen release and absorption temperatures drops to 110 °C and 60 °C, respectively, and the activation energy of hydrogen release decreased from 120.0 kJ/mol to 102.5 kJ/mol, the hydrogen storage capacity of has almost no decay after 10 absorption/desorption cycles. In addition, the mechanism of CeH2.51 improving the hydrogen storage performance of Mg(NH2)2-2LiH was also clarified by various characterizations.
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