Novel catalytic effects of fullerene for LiBH₄hydrogen uptake and release

Mechano-chemical synthesis of manganese borohydride (Mn(BH4)2) and inverse cubic spinel (Li2MnCl4) in the (nLiBH4 + MnCl2) (n = 1, 2, 3, 5, 9 and 23) mixtures and their dehydrogenation behavior

“…4b) and is proportionally shorter at 140 and 200 C. Table 1 shows the H 2 quantities experimentally desorbed at 100 and 200 C compared to the maximum theoretical quantities of H 2 expected to be desorbed from Mn(BH 4 ) 2 for various molar ratios n calculated according to reaction (7). It is observed that at 100 and 200 C the quantities of H 2 desorbed from Mn(BH 4 ) 2 do not exceed the theoretical H 2 quantities expected to be desorbed from a mixture with n ¼ const according to reaction (7). It clearly confirms the fact, already observed in Fig.…”

The role of Ni in increasing the reversibility of the hydrogen release from nanoconfined LiBH4

“…11 However later research showed that SiO 2 reacts with LiBH 4 to form stable silicates 23,24 while irreversibly releasing hydrogen, as is the case with most metal oxide additives. 25,26 A large range of materials, including metal halides, 12,14,27 Al, Pt, carbon nanotubes, fullerene and Ni, 13,[15][16][17]28 has been investigated in an effort to identify an effective catalyst for LiBH 4 de/rehydrogenation. Addition of these materials generally led to a decrease in the dehydrogenation temperatures but most of the systems still required temperatures above 400 C and hydrogen pressures above 40 bar for only achieving partial rehydrogenation of the desorbed material.…”

Reversibility of the hydrogen desorption from LiBH4: a synergetic effect of nanoconfinement and Ni addition

“…This includes the use of metal oxides and halides, Pt, Ni, and carbon nanomaterials. [4][5][6][7][8][9][10] Although addition of these materials resulted in lower dehydrogenation temperatures, there was no large impact on reversibility. For example, ball milling LiBH 4 with Ni decreased the onset of hydrogen release to 300 1C, but severe conditions (600 1C, 100 bar H 2 for 30 h) were still required for partial rehydrogenation (12 wt% H 2 ) of the system.…”