Reinforce the dehydrogenation process of LiAlH4 by accumulating porous activated carbon

Improved dehydrogenation performance of LiAlH4 doped with BaMnO3

“…Unfortunately, after desorption, AlH 3 is converted to pure Al with poor reversibility, which makes it impractical to use as a hydrogen energy carrier [ 19 ]. LiAlH 4 has been gaining a lot of interest as an ideal solid-state hydrogen storage material because of its high energy content (10.5 wt%) [ 20 , 21 ]. The thermal dissociation of LiAlH 4 proceeds in a few steps below [ 22 ].…”

Confinement of LiAlH4 in a Mesoporous Carbon Black for Improved Near-Ambient Release of H2

“…Confinement inside a porous scaffold, addition of catalysts, and mixing with other complex metal hydrides have been used for this effect to decrease the temperature of H 2 release, improve the kinetics, and improve cyclability through hydrogenation at lower H 2 pressure and temperature conditions by weakening the Al-H bond [10,[12][13][14][15][16][17][18][19][20][21]. For example, the addition of nano-sized TiH 2 [17] and nano-sized TiC [18] decreased the onset temperature of H 2 release down to 350 K, and the majority of H 2 from decomposition steps R1 and R2 was released during 15 min at 393 K. A part in the catalytic effect was attributed to the weakening of the Al-H bonds, where the Al-H band in infrared spectroscopy shifted to higher frequencies when TiC doping was applied [18].…”

“…Confinement of LiAlH 4 in various porous carbonaceous materials has been shown to decrease the temperature of H 2 release and to improve the kinetics of H 2 release by weakening the Al-H bonds, nano-sizing effects, improved solid-gas interactions, and shorter diffusion paths for ions [13][14][15]. With the use of only 10 mass% of activated carbon addition, the onset temperature of H 2 release decreased to 373 K for R1 and 430 K for R2 and was accompanied by a decrease in the activation energy from 91 kJ mol −1 to 70 kJ mol −1 and from 100 kJ mol −1 to 85 kJ mol −1 for the first two decomposition reactions, R1 and R2, respectively [13].…”

“…Confinement of LiAlH 4 in various porous carbonaceous materials has been shown to decrease the temperature of H 2 release and to improve the kinetics of H 2 release by weakening the Al-H bonds, nano-sizing effects, improved solid-gas interactions, and shorter diffusion paths for ions [13][14][15]. With the use of only 10 mass% of activated carbon addition, the onset temperature of H 2 release decreased to 373 K for R1 and 430 K for R2 and was accompanied by a decrease in the activation energy from 91 kJ mol −1 to 70 kJ mol −1 and from 100 kJ mol −1 to 85 kJ mol −1 for the first two decomposition reactions, R1 and R2, respectively [13]. Mesoporous carbon with N defect sites as a scaffold for LiAlH 4 confinement has been shown to be reversibly hydrogenated under 100 MPa of H 2 with a yield of 80%, where the reversible hydrogenation of LiAlH 4 after the release of H 2 has been a major hurdle for the use of LiAlH 4 as a H 2 storage material [12].…”