Improvement of hydrogen storage properties of the Li-Mg-N-H system by addition of LiBH4

被引：103

作者：

Hu, Jianjiang ^{[1
]}

Liu, Yongfeng ^{[1
]}

Wu, Guotao ^{[1
]}

Xiong, Zhitao ^{[1
]}

Chua, Yong Shen ^{[2
]}

Chen, Ping ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117543, Singapore

[2] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 13期

关键词：

D O I：

10.1021/cm800584x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Significant improvements in the hydrogen desorption/absorption properties of the Li-Mg-N-H system have been achieved by adding a small amount of LiBH4. The onset as well as the peak temperatures of hydrogen desorption shift to lower temperatures. Five wt % of hydrogen can be fully desorbed at 140 degrees C and reabsorbed at 100 degrees C. The kinetics of hydrogen desorption as well as absorption were found to be 3 times as fast as the pristine system. Thermodynamic analyses show that the temperature for equilibrium desorption pressure at I bar was 70 degrees C, which is about 20 degrees C lower than the pristine system. The enhancement in the hydrogen sorption properties was attributed to the weakening of N-H bonding in the metal amide molecules.

引用

页码：4398 / 4402

页数：5

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