Desorption properties of MgH_2 composite with a composition of 40MgH_2 + 37LiBH_4 + 18MgF_2 + 5Ti isopropoxide

摘要

In order to increase the hydrogen storage capacity of Mg-based materials, a mixture with a composition of 2LiBH_4 + MgF_2 and LiBH_4, which has a hydrogen storage capacity of 18.4 wt%, were added to MgH_2. Ti isopropoxide was also added to MgH_2 as a catalyst. A MgH_2 composite with a composition of 40 wt%MgH_2 + 25 wt%LiBH_4 + 30 wt% (2LiBH_4 + MgF_2) + 5 wt%Ti isopropoxide (corresponding to 40 wt%MgH_2 + 37 wt% LiBH_4 + 18 wt%MgF_2 + 5 wt%Ti isopropoxide) was prepared by reactive mechanical grinding. The hydrogen storage properties of the sample were then examined. Hydrogen content vs. desorption time curves for consecutive 1st desorptions of 40 wt%MgH_2 + 37 wt %LiBH_4 + 18 wt%MgF_2 + 5 wt%Ti isopropoxide from room temperature to 823 K showed that the total desorbed hydrogen quantity for consecutive 1st desorptions was 8.30 wt%.