Fe₃O₄ nanoclusters highly dispersed on a porous graphene support as an additive for improving the hydrogen storage properties of LiBH₄

Effect of Carbonized 2-Methylnaphthalene on the Hydrogen Storage Performance of MgH2

“…To further reveal the kinetics improvement, the apparent activation energy ( E a ) for the CMN-MgH 2 composite and MgH 2 were calculated on the basis of Kissinger’s equation (eq ) from the DSC data …”

In Situ Introduction of Li3BO3 and NbH Leads to Superior Cyclic Stability and Kinetics of a LiBH4-Based Hydrogen Storage System

“…Direct addition of Li 3 BO 3 by ball-milling is reported to favor the hydrogen storage properties of LiBH 4 ; however, it does not show high efficiency even with Li 3 BO 3 as high as 30 wt %. 42 In addition, in situ generation of Li 3 BO 3 in LiBH 4 -based systems has been reported in the literature, 25,43,44 which also favors the hydrogen storage properties of LiBH 4 . However, all the reported Li 3 BO 3 is formed from the reaction of LiBH 4 and the oxygenic groups in the systems, such as the oxygenic groups in the Fe 3 O 4 @rGO additive, 25 in the scaffold of carbon nanocages, 43 or in the pyrolysed polyaniline.…”

“…However, there is only 4.0 wt % of H 2 released in the second cycle upon heating to 500 °C and the onset dehydrogenation temperature increases again to a high temperature of 300 °C for the postdehydrogenation product hydrogenated at 350 °C and a H 2 pressure of 100 bar . For the doping of a Fe 3 O 4 nanocluster-anchored porous reduced graphene composite (Fe 3 O 4 @rGO), the onset temperature of LiBH 4 reduces to 74 °C due to a reaction of Fe 3 O 4 with LiBH 4 , but its main dehydrogenation temperature is still as high as 220 °C and the improvement in dehydrogenation kinetics and the reversibility of LiBH 4 are very limited …”

“…24 For the doping of a Fe 3 O 4 nanocluster-anchored porous reduced graphene composite (Fe 3 O 4 @rGO), the onset temperature of LiBH 4 reduces to 74 °C due to a reaction of Fe 3 O 4 with LiBH 4 , but its main dehydrogenation temperature is still as high as 220 °C and the improvement in dehydrogenation kinetics and the reversibility of LiBH 4 are very limited. 25 Combining other hydrogen storage materials to form reactive systems is also effective in improving the hydrogen storage property of LiBH 4 , 26−29 such as the 2LiBH 4 −MgH 2 system reported first by Vajo et al 29 In a previous report from our group, a combined system of LiBH 4 + Ca(BH 4 ) 2 modified by a hydrogenated LaMg 3 alloy leads to a low dehydrogenation temperature of ca. 200 °C, and the product postdehydrogenated at 350 °C for 30 min can absorb approximately 5.4 wt % H 2 upon heating to 450 °C under 90 bar of H 2 .…”

Single-walled carbon nanotubes/lithium borohydride composites for hydrogen storage: role of in situ formed LiB(OH)4, Li2CO3 and LiBO2 by oxidation and nitrogen annealing

“…18 Moreover, it is reported that increasing the catalyst loading signicantly reduces the dehydrogenation temperatures with increased hydrogen release from LiBH 4 . [17][18][19] They added that the contact between graphene catalyst and LiBH 4 enhances reversibility and dehydrogenation kinetics. [17][18][19] Other researchers have reported that conning LiBH 4 in mesoporous carbon, [20][21][22][23][24] MWCNT, 25,26 SWCNT, 27 nanoporous carbon, 28 carbon nanober, 29 reduces the onset decomposition and main hydrogen release temperature signicantly than that of pristine LiBH 4 .…”