Hydrogen storage properties of destabilized MgH2-Li3AlH6 system
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
KeywordHydrogen Storage Mgh2 Li3alh6 Cycle Stability Kinetics
Indexed BySCI ; ISTP
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS Research AreaChemistry ; Electrochemistry ; Energy & Fuels
AbstractTo 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.
WOS IDWOS:000281383900058
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Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
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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.
APA Liu, Shu-Sheng.,Sun, Li-Xian.,Zhang, Jian.,Zhang, Yao.,Xu, Fen.,...&Deng, Hui-Qiu.(2010).Hydrogen storage properties of destabilized MgH2-Li3AlH6 system.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,35(15),8122-8129.
MLA Liu, Shu-Sheng,et al."Hydrogen storage properties of destabilized MgH2-Li3AlH6 system".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 35.15(2010):8122-8129.
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