The effects of the micrometric and nanometric iron (Fe) additives on the mechanical and thermal dehydrogenation of lithium alanate (LiAlH4), its self-discharge at low temperatures and rehydrogenation

Metastable Metal Hydrides for Hydrogen Storage

“…For example, the group 1 tetrahydroaluminates (e.g., LiAlH 4 ) typically decompose to a hexahydridoaluminate first, then to a binary hydride (and Al), and finally to the alloy (LiAl) [31,43], as shown below:…”

“…A list of decomposition reactions, along with the amount of H 2 released and the reaction enthalpy (ΔH), is shown in Table 3. A plot of the calculated equilibrium pressure as a function of temperature (van't Hoff plot) for several metastable hydrides is shown in Figure 5 [20,37,43,44,85,86]. It is important to note that the values used in Figure 5 correspond to H 2 fugacities, not hydrogen pressures.…”

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

“…Recently, it has been reported for the first time by Varin et al that a few ball milled LiAlH 4 -based mixtures combined with nanometric-size metal catalysts [18,24], complex hydride LiNH 2 [25] and a MnCl 2 catalytic precursor [33] continuously self-discharge H 2 when stored for a prolonged time in glass vials at a temperature range from room temperature (RT) to 80 C under slight overpressure of high purity argon. In order to find out if the same phenomenon occurs for the present (nLiBH 4 þ MnCl 2 ) mixtures, first of all, a ball milled (2LiBH 4 þ MnCl 2 ) mixture, which according to reaction (6) and Fig.…”

“…2a contains mainly Mn(BH 4 ) 2 , 2 mol LiCl and 1 mol of retained LiBH 4 . Following procedures reported in [18,24,33] after a pre-determined length of time small samples stored at RT and 40 C were extracted from the vial and fully dehydrogenated isothermally at a temperature of 140 C in a Sieverts-type apparatus under 1 bar H 2 pressure, registering the quantity of H 2 desorbed. It was already reported in [13] that the addition of nanometric Ni (n-Ni) to (3LiBH 4 þ MnCl 2 ) slightly accelerated dehydrogenation and reduced the apparent activation energy for dehydrogenation.…”

NbCl5 and CrCl3 catalysts effect on synthesis and hydrogen storage performance of Mg–Ni–NiO composites

“…A number of materials ranging from interstitial metal hydrides to complex hydrides such as alanates, borohydrides and imides have been extensively studied (Ismail et al 2011;Varin and Jang 2011;Li et al 2011;Varin and Parviz 2012;Jiang et al 2012). Interstitial metal hydrides such as LaNi 5 H 6 can absorb hydrogen rapidly and reversibly at moderate temperature and pressures, but hydrogen storage capacity limits their potential for hydrogen storage.…”