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Abstract
Significant improvements in the hydrogen desorption/absorption properties of the Li-Mg-N-H system have been achieved by adding a small amount of LiBH 4. 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 °C and reabsorbed at 100°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 1 bar was 70°C, which is about 20°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. © 2008 American Chemical Society.
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Chemistry of Materials
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Date
2008-07-08
DOI
10.1021/cm800584x
Type
Article