Desorption properties of MgH2 composite with a composition of 40MgH2 + 37LiBH4 + 18MgF2 + 5Ti isopropoxide

In order to increase the hydrogen storage capacity of Mg-based materials, a mixture with a composition of 2LiBH4 + MgF2 and LiBH4, which has a hydrogen storage capacity of 18.4 wt%, were added to MgH2. Ti isopropoxide was also added to MgH2 as a catalyst. A MgH2 composite with a composition of 40 wt%MgH2 + 25 wt%LiBH4 + 30 wt% (2LiBH4 + MgF2) + 5 wt%Ti isopropoxide (corresponding to 40 wt%MgH2 + 37 wt%LiBH4 + 18 wt%MgF2 + 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%MgH2 + 37 wt%LiBH4 + 18 wt%MgF2 + 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%.

Hydrogen content vs. desorption time curves for consecutive 1st desorptions of 40MgH2 + 37LiBH4 + 18MgF2 + 5Ti isopropoxide from room temperature to 823 K. Curve (a) is followed by curve (b), and curve (b) is followed by curve (c).Figure optionsDownload as PowerPoint slideHighlights
► Addition of 2LiBH4 + MgF2 and LiBH4 (hydrogen storage capacity 18.4 wt%) to MgH2.
► Addition of Ti isopropoxide to MgH2 as a catalyst.
► Composition of 40 wt%MgH2 + 25 wt%LiBH4 + 30 wt% (2LiBH4 + MgF2) + 5 wt%Ti isopropoxide.
► Preparation of 40 wt%MgH2 + 37 wt%LiBH4 + 18 wt%MgF2 + 5 wt%Ti isopropoxide.
► Total desorbed hydrogen quantity of 8.30 wt% for consecutive 1st desorptions.