Enhanced dehydrogenation/hydrogenation kinetics of the Mg(NH2)2–2LiH system with NaOH additive

Improved Hydrogen‐Storage Thermodynamics and Kinetics for an RbF‐Doped Mg(NH2)2–2 LiH System

“…[11,14,15] Since both MgA C H T U N G T R E N N U N G (NH 2 ) 2 and LiH are stable when ball-milled alone, hydrogen release comes from the chemical reaction between MgA C H T U N G T R E N N U N G (NH 2 ) 2 and LiH. [14,15] Interestingly, the presence of RbF retarded the hydrogen desorption in the ball-milling process. The dehydrogenation amount of the 0.01 RbFdoped sample was decreased to about 0.28 mol equiv hydrogen atoms, and only 0.21 mol equiv hydrogen atoms were released from the sample with 0.08 mol RbF.…”

Synthesis of CsH and its effect on the hydrogen storage properties of the Mg(NH2)2-2LiH system

“…More importantly, the presence of Na, K or Rb in the LieMgeNeH system significantly improved its hydrogen storage properties. The majority of hydrogen desorption in the Mg(NH 2 ) 2 -2LiH-0.5NaOH system was completed below 175 C, which is 36 C less than that of the pristine sample [23]. The peak dehydrogenation temperature of the Mg(NH 2 ) 2 -1.9LiH-0.1KH sample was reduced from 186 to 132 C, and reversible hydrogen storage was achieved at temperatures as low as 107 C in a pressure-compositiontemperature (PCT) model [24].…”

Potassium, rubidium and cesium hydrides as dehydrogenation catalysts for the lithium amide/magnesium hydride system

“…2LiNH 2 þ MgH 2 /MgðNH 2 Þ 2 þ 2LiH4Li 2 MgðNHÞ 2 þ 2H 2 (1) Recently, more work has been focused on lowering the desorption temperature and improving the kinetics of the 2LiNH 2 /MgH 2 system with effective catalysts. Additives such as V, V 2 O 5 , VCl 3 [16], Graphite-supported Ru nanoparticles [17], LiBH 4 and ZrCo 3 H [18,19], Single walled carbon nanotubes [20], NaOH [21], lithium halides [22,23] and Si and Al [24] have been tried. But alkali metal based hydrides have been found to be among the most effective catalytic additives [25e27].…”