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题名: Hydrogen De/Resorption Properties of the LiBH4-MgH2-Al System
作者: Zhang, Yao1;  Tian, Qifeng2, 3;  Chu, Hailiang4;  Zhang, Jian1;  Sun, Lixian1;  Sun, Juncai5;  Wen, Zhongsheng5
通讯作者: 张耀
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-12-31
DOI: 10.1021/jp9068366
卷: 113, 期:52, 页:21964-21969
收录类别: SCI
文章类型: Article
部门归属: 15,19
项目归属: 1504,1901
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The synthesized LiBH4-MgH2-Al (4:1:1 mole ratio) composite exhibits reversible de/rehydrogenation properties. Thermogravimetry and differential scanning calorimetry indicate that the dehydrogenation onset temperature is reduced by 100 K from that of 2LiBH(4)-MgH2 and 2LiBH(4)-Al systems. The major dehydrogenation pathway for the 4LiBH(4)-MgH2-Al complex system can be identified as 4LiBH(4) + MgH2 + Al -> 4LiH + MgAlB4 + 7H(2) by means of X-ray diffraction (XRD) measurements on the as-de hydrogenated samples. The isothermal dehydrogenation measurements exhibit that the maximum dehydrogenation amount (9.4 wt % H-2, 673 K) approaches the theoretical value (9.9 wt % H-2) of the reaction. Through pressure-composition isotherms (P-C-T) and the van't Hoff equation, the dehydrogenation enthalpy and entropy of the 4LiBH(4)-MgH2-Al system can be determined as 57 kJ/mol-H-2 and 75 J/K.mol-H-2, respectively. The system is slightly destabilized from pristine LiBH4 (Delta H-de degrees = 68 kJ/mol-H-2) by coadditives of MgH2 and Al. The XRD measurements on the rehydrogenated samples suggest that the above reaction is partially reversible and the backward reaction takes place in two steps as 4LiH + MgAlB4 + 6H(2) -> Mg + 4LiBH(4) + Al and Mg + H-2 -> MgH2. Because of the alloying of Mg with Al, MgH2 in the complex system cannot be fully recovered below the temperature of 673 K. The isothermal rehydrogenation measurements exhibit significantly enhanced kinetics for the LiH-MgAlB4 system compared with LiH-MgB2 and LiH-AlB2 systems.
关键词[WOS]: MODIFIED LITHIUM BOROHYDRIDES ;  STORAGE MATERIALS ;  LIBH4 ;  DESTABILIZATION ;  COMPOSITES ;  HYDRIDES ;  RELEASE ;  CARBON ;  IMIDES ;  AL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000272936400069
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/102725
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, Lab Catalysis & New Mat Aerosp, Mat & Thermochem Grp, Dalian 116023, Peoples R China
2.Wuhan Inst Technol, Minist Educ, Key Lab Green Chem Proc, Wuhan 430073, Peoples R China
3.Wuhan Inst Technol, Hubei Key Lab Novel Reactor & Green Chem Technol, Wuhan 430073, Peoples R China
4.Chinese Acad Sci, Dalian Inst Chem Phys, Hydride Mat Res Grp, Dalian 116023, Peoples R China
5.Dalian Maritime Univ, Dept Mat Sci & Engn, Dalian 116026, Peoples R China

Recommended Citation:
Zhang, Yao,Tian, Qifeng,Chu, Hailiang,et al. Hydrogen De/Resorption Properties of the LiBH4-MgH2-Al System[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(52):21964-21969.
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