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题名: Hydrogen storage properties of destabilized MgH2-Li3AlH6 system
作者: Liu, Shu-Sheng1, 3;  Sun, Li-Xian1;  Zhang, Jian1;  Zhang, Yao1;  Xu, Fen2;  Xing, Yong-Heng2;  Li, Fen1;  Zhao, Jijun4;  Du, Yong5;  Hu, Wang-Yu6;  Deng, Hui-Qiu6
关键词: Hydrogen storage ;  MgH2 ;  Li3AlH6 ;  Cycle stability ;  Kinetics
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2010-08-01
DOI: 10.1016/j.ijhydene.2010.01.018
卷: 35, 期:15, 页:8122-8129
收录类别: SCI ;  ISTP
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: To improve the dehydrogenation properties of MgH2, a novel hydrogen storage system, MgH2-Li3AlH6, is prepared by mechanochemical milling. Three physical mixtures containing different mole ratios (1:4, 1:1 and 4:1) of MgH2 and Li3AlH6 are studied and there exists a mutual destabilization effect between the components. The last mixture shows a capacity of 6.5 wt% H-2 with the lowest starting temperature of dehydrogenation (170 degrees C). First, Li3AlH6 decomposes into Al, LiH and H-2, and then the as-formed Al can easily destabilize MgH2 to form the intermetallic compound Mg17Al12 at a temperature of 235 degrees C, which is about 180 degrees C lower than the decomposition temperature of pristine MgH2. Finally, the residual MgH2 undergoes a self-decomposition whose apparent activation energy has been reduced by about 22 kJ mol(-1) compared with pristine MgH2. At a constant temperature of 250 degrees C, the mixture can dehydrogenate completely under an initial vacuum and rehydrogenate to form MgH2 under 2 MPa H-2, showing good cycle stability after the first cycle with a capacity of 4.5 wt% H-2. The comparison between 4 MgH2+Li3AlH6 and 4 MgH2 + LiAlH4 mixtures is also investigated. (c) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: ABSORPTION/DESORPTION PROPERTIES ;  LIALH4 ;  MGH2 ;  MICROSTRUCTURE ;  MAGNESIUM ;  COMPOSITE ;  LI3ALH6
语种: 英语
WOS记录号: WOS:000281383900058
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142161
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
2.Liaoning Normal Univ, Fac Chem & Chem Engn, Liaoning, Peoples R China
3.Chinese Acad Sci, China Grad Sch, Beijing 100049, Peoples R China
4.Dalian Univ Technol, Lab Mat Modificat Laser Electron & Ion Beams, Dalian 116024, Peoples R China
5.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
6.Hunan Univ, Dept Appl Phys, Changsha 410082, Peoples R China

Recommended Citation:
Liu, Shu-Sheng,Sun, Li-Xian,Zhang, Jian,et al. Hydrogen storage properties of destabilized MgH2-Li3AlH6 system[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2010,35(15):8122-8129.
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