Differential Scanning Calorimetry Measurements of Magnesium Borohydride Mg(BH<SUB>4</SUB>)<SUB>2</SUB>

Abstract

Multistep dehydriding reactions of magnesium borohydride Mg(BH 4 ) 2 were studied by Differential Scanning Calorimetry (DSC) measurements. The values of the enthalpy changes of the reactions from the measurements are in good agreement with those from first-principles calculations. Kinetically restricted dehydriding reaction of Mg(BH 4 ) 2 , suggested also by the measurements, was briefly discussed.

Recent Progress in Metal Borohydrides for Hydrogen Storage

“…Mg(BH 4 ) 2 releases approximately 14.9 mass% of hydrogen when heated up to 870 K [56][57][58][59][60][61][62][63][64][65][66]. The dehydrogenation process is found to also proceed through multiple steps together with the formation of intermediate compounds [62,63,65], as summarized in Figure 2.…”

Formation Process of [B<SUB>12</SUB>H<SUB>12</SUB>]<SUP>2&minus;</SUP> from [BH<SUB>4</SUB>]<SUP>&minus;</SUP> during the Dehydrogenation Reaction of Mg(BH<SUB>4</SUB>)<SUB>2</SUB>

“…1) Recently, intensive studies have been conducted on the synthesis, structural characterizations, and dehydrogenation and rehydrogenation properties of Mg(BH 4 ) 2 . [2][3][4][5][6][7][8][9][10][11] Upon heating, the dehydrogenation amount of Mg(BH 4 ) 2 was reported to be 14.9 mass% of hydrogen according to following reactions. 5,9,10) Mg(BH 4 ) 2 !…”

“…8,10) However, it has been found that the dehydrogenation temperature is greater than 500 K. 2,[4][5][6][9][10][11] À . This study provides a fundamental insight into the further enhancement of the dehydrogenation properties of Mg(BH 4 ) 2 .…”

Lewis Base Complexes of Magnesium Borohydride: Enhanced Kinetics and Product Selectivity upon Hydrogen Release

“…Only a few of the thousands of materials investigated have garnered as much interest as Mg(BH 4 ) 2 [1][2][3][4][5][6][7][8][9][10][11][12]. The high gravimetric density of H 2 , ca.…”