{"title":"Effect of BaH2 on the hydrogen storage properties of Mg(NH2)2-LiH","authors":"Chengjie Long, Xiaowei Hu, Haijun Zhong, Ren Zou, Jialing Li, Zibo Cheng, Gangtie Lei, Yue Wang, Hujun Cao","doi":"10.1016/j.jallcom.2025.179107","DOIUrl":null,"url":null,"abstract":"The Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH composite has garnered extensive attention on account of its high theoretical hydrogen storage capacity (5.6<!-- --> <!-- -->wt%) and favorable thermodynamic properties (ca. 40<!-- --> <!-- -->kJ/mol-H<sub>2</sub>). However, the sluggish kinetics restricts its practical application. In this study, we investigated in detail the effect of BaH<sub>2</sub> doping on the hydrogen absorption and desorption properties of Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH. Experimental results demonstrated that the incorporation of BaH<sub>2</sub> significantly enhances the hydrogen absorption/desorption kinetic performance compared to the pristine sample. The optimum overall performance was achieved for the sample doped with 0.05 BaH<sub>2</sub>. Its initial hydrogen release temperature and peak dehydrogenation temperature were decreased by 30 and 20 °C, respectively. The rate of hydrogen release during isothermal dehydrogenation at 160 °C was twice as fast as that of the undoped sample, and the interrelated activation energy was reduced from 112.8 to 72.2<!-- --> <!-- -->kJ/mol. Additionally, the mechanism underlying improvement of the hydrogen storage performance in the Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH composite by BaH<sub>2</sub> was elucidated.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"62 1","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2025.179107","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The Mg(NH2)2-2LiH composite has garnered extensive attention on account of its high theoretical hydrogen storage capacity (5.6 wt%) and favorable thermodynamic properties (ca. 40 kJ/mol-H2). However, the sluggish kinetics restricts its practical application. In this study, we investigated in detail the effect of BaH2 doping on the hydrogen absorption and desorption properties of Mg(NH2)2-2LiH. Experimental results demonstrated that the incorporation of BaH2 significantly enhances the hydrogen absorption/desorption kinetic performance compared to the pristine sample. The optimum overall performance was achieved for the sample doped with 0.05 BaH2. Its initial hydrogen release temperature and peak dehydrogenation temperature were decreased by 30 and 20 °C, respectively. The rate of hydrogen release during isothermal dehydrogenation at 160 °C was twice as fast as that of the undoped sample, and the interrelated activation energy was reduced from 112.8 to 72.2 kJ/mol. Additionally, the mechanism underlying improvement of the hydrogen storage performance in the Mg(NH2)2-2LiH composite by BaH2 was elucidated.
期刊介绍：
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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