Dehydrogenation kinetics of 2LiBH(4) + MgH2 enhanced by hydrogen back pressure and a CuCl2 catalyst

作者：Jiang, Ying; Liu, Bin Hong^*

来源：Journal of Alloys and Compounds, 2011, 509(37): 9055-9059.

DOI：10.1016/j.jallcom.2011.05.087

• Reactive hydride composite
• Dehydrogenation
• Kinetics
• Hydrogen back pressure
• Nucleation

In this work, the dehydrogenation kinetics of the 2LiBH(4) + MgH2 composite under different hydrogen back pressures was studied. The applied hydrogen back pressure significantly influenced the hydrogen release rate of the uncatalyzed composite. Higher hydrogen pressures enhanced the nucleation of MgB2, resulting in better dehydrogenation kinetics and cycle stability. The composite with a CuCl2 catalyst demonstrated significantly improved dehydrogenation kinetics because the nucleation of MgB2 was promoted by heterogeneous nuclei. However, similar effects of hydrogen back pressure on dehydrogenation kinetics were also observed for the CuCl2-catalyzed composite. The extraordinary results suggest that hydrogen back pressure plays an indispensable role in the formation of MgB2, which determines not only the reaction pathway but also the kinetics of dehydrogenation for the 2LiBH(4) + MgH2 composite.

• 出版日期2011-9-15
• 单位浙江大学