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题名: Effects of Al-based additives on the hydrogen storage performance of the Mg(NH2)(2)-2LiH system
作者: Cao, Hujun1, 2, 3;  Zhang, Yao1;  Wang, Jianhui1;  Xiong, Zhitao1;  Wu, Guotao1;  Qiu, Jieshan2;  Chen, Ping1, 4
刊名: DALTON TRANSACTIONS
发表日期: 2013
DOI: 10.1039/c3dt32165g
卷: 42, 期:15, 页:5524-5531
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Inorganic & Nuclear
研究领域[WOS]: Chemistry
英文摘要: The Mg(NH2)(2)-2LiH composite is a promising hydrogen storage material due to its relatively high reversible hydrogen capacity (similar to 5.6 wt%) and suitable thermodynamic properties that allow hydrogen sorption conducting at temperatures below 90 degrees C. However, the presence of a severe kinetic barrier inhibits its low-temperature operation. In the present work, Li3AlH6 was introduced to the Mg(NH2)(2)-2LiH system. Experimental results show that a 3.2% mol Li3AlH6-modified Mg(NH2)(2)-2LiH sample released hydrogen at a rate ca. 4.5 times as fast as that of the Li3AlH6-free sample at 140 degrees C. The enhancement of desorption kinetics was simultaneously demonstrated by activation energy (E-a) of ca. 96.3 +/- 9 kJ mol(-1) which was significantly decreased by 31 kJ mol(-1) from that of the Li3AlH6-free sample. The interaction of Li3AlH6 and Mg(NH2)(2) during ball milling results in the formation of LiAl(NH)(2), LiNH2 and Mg3N2. LiAl(NH)(2) was actually the active species for the enhancement of dehydrogenation/re-hydrogenation kinetics of the system.
关键词[WOS]: N-H SYSTEM ;  THERMAL-DECOMPOSITION ;  CRYSTAL-STRUCTURE ;  LI ;  DESORPTION ;  ABSORPTION ;  HYDRIDE ;  LIBH4 ;  LIAL(NH2)(4) ;  IMPROVEMENT
语种: 英语
WOS记录号: WOS:000316300700040
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137849
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, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Dalian Univ Technol, Carbon Res Lab, Liaoning Key Lab Energy Mat & Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Int Inst Carbon Neutral Energy Res I2CNER, Nishi Ku, Fukuoka 8190395, Japan

Recommended Citation:
Cao, Hujun,Zhang, Yao,Wang, Jianhui,et al. Effects of Al-based additives on the hydrogen storage performance of the Mg(NH2)(2)-2LiH system[J]. DALTON TRANSACTIONS,2013,42(15):5524-5531.
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