Niobium fluoride-modified hydrogen evolution reaction of magnesium borohydride diammoniate
作者机构：School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Institute of Energy Power InnovationNorth China Electric Power UniversityBeijing102206China Jiangsu JITRI Advanced Energy & Materials Research Institute Co.Ltd.Changzhou213000China Department of Materials ScienceFudan UniversityShanghai200433China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第156卷第25期
页 面：197-205页
核心收录：
学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by the National Key Research and Development Plan(Grant No.2021YFB3802400) the National Natural Science Foundation of China(Grant Nos.52071141,52271212,52201250) the Equipment Pre-research Field Foundation(Grant No.6140721040101) the Interdisciplinary Innovation Program of North China Electric Power University(Grant No.XM2112355)
主 题：Hydrogen storage Magnesium borohydride Ammoniates NbF5 Catalysis
摘 要：Metal borohydride ammoniates have become one of the most promising hydrogen storage materials due to their ultrahigh ***,their application is still restricted by the high temperature of hydrogen desorption and the release of ***,to promote the dehydrogenation evolution and suppress the ammonia release,different amounts of NbF 5 were introduced into Mg(BH4)2·*** to the pure Mg(BH_(4))_(2)·2NH_(3),the Mg(BH_(4))_(2)·2NH_(3)-NbF_(5) composites exhibit lower onset dehydriding temperatures(53–57℃)and higher dehydriding capacities(5.6 wt.%–8.2 wt.%)at below 200℃,with the complete suppression of *** addition,7.4 wt.%H_(2) could be released from Mg(BH_(4))_(2)·2NH_(3)–5 mol%NbF5 composite at 200℃ within 20 min and the apparent activation energy is calculated to be 60.28 kJ mol^(-1),which is much lower than that of pure Mg(BH_(4))_(2)·2NH_(3)(92.04 kJ mol^(-1)).Mg(BH_(4))_(2)·2NH_(3) should mechanochemically react with NbF5,forming dual-metal(Mg,Nb)borohydride ammoniate and spherical *** introduction of electronegative Nb cation results in-situ formation of(Mg,Nb)borohydride ammoniate towards a lower dehydrogenation temperature and a higher hydrogen release *** increased phase boundaries among the Mg(BH_(4))_(2)·2NH_(3),dual-metal(Mg,Nb)borohydride ammoniate,and MgF2 phases further facilitate the hydrogen diffusion during the dehydrogenation of the composites.
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