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

作者：Hu Jianjiang; Liu Yongfeng; Wu Guotao; Xiong Zhitao; Chua Yong Shen; Chen Ping^*

来源：Chemistry of Materials, 2008, 20(13): 4398-4402.

DOI：10.1021/cm800584x

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.

• 出版日期2008-7-8