Scandium and vanadium borohydride ammoniates: Enhanced dehydrogenation behavior upon coordinative expansion and establishment of Hδ+⋯−δH interactions

Tailoring the Properties of Ammine Metal Borohydrides for Solid‐State Hydrogen Storage

“…Future research may also address this issue, for example, by detailed analysis of the reaction mechanism for hydrogen absorption of dehydrogenated nanoconfined Al(BH 4 ) 3 ·6NH 3 treated with hydrazine in liquid ammonia similar to other B-N based materials. [24,[57][58][59][60][61] …”

“…[13,22] A range of other ammine metal borohydrides have been synthesized by a metathesis reaction of the ammine metal chloride, MCl m ·nNH 3 and lithium borohydride, LiBH 4 . [23][24][25] The resulting samples contain significant amounts of LiCl acting as a 'deadweight', which reduces the hydrogen storage capacity and possibly also reversibility due to formation of inert metal chlorides. Release of ammonia is detrimental for many applications, for example, in low-temperature polymer electrolyte membrane fuel cells, and needs to be reduced by proper materials design, which was recently addressed by a series of ammine magnesium borohydrides, Mg(BH 4 ) 2 ·nNH 3 (n = 1, 2, 3).…”

Ammonia borane modified zirconium borohydride octaammoniate with enhanced dehydrogenation properties

“…[3][4][5][6][7][8][9][10][11] Boronnitrogen (B-N)-based hydrides have received great attention as potential candidates for solid-state hydrogen storage materials due to their high gravimetric hydrogen densities and favorable dehydrogenation properties. [15][16][17][18][19][20][21][22][23][24][25] Recently, zirconium borohydride octaammoniate, Zr(BH 4 ) 4 $8NH 3 , with the highest coordination number of NH 3 groups among all reported MBAs had been synthesized. [15][16][17][18][19][20][21][22][23][24][25] Recently, zirconium borohydride octaammoniate, Zr(BH 4 ) 4 $8NH 3 , with the highest coordination number of NH 3 groups among all reported MBAs had been synthesized.…”

Synthesis, structures and hydrogen storage properties of two new H-enriched compounds: Mg(BH4)2(NH3BH3)2 and Mg(BH4)2·(NH3)2(NH3BH3)

“…3 Fortunately, introducing neutral hydrogen-rich molecules of ammonia through the formation of an intensive NH⋯HB dihydrogen bonding network into ammine metal borohydrides (AMBs) provides a prospective strategy to lower the decomposition temperature of metal borohydrides. [10][11][12][13][14][15][16][17][18][19][20][21] Based on the NH⋯HB dihydrogen mechanism, a recent study showed that LiBH 4 and Ca(BH 4 ) 2 can readily combine with another H-enriched compound, ammonia borane (NH 3 BH 3 , AB), 22 to form new layered borohydride ammonia borane complexes via the NH⋯HB dihydrogen bonding. 23 However, the borohydrides and AB components prefer to decompose independently, therefore little improved dehydrogenation was achieved within these borohydride ammonia borane complexes.…”