Hydrogen in combination with a fuel cell is the most attractive option for a long-term sustainable energy development. Finding an efficient hydrogen storage material is one of the critical factors in realizing a hydrogen economy. Hydrazine borane (N2H4BH3, HB), with a 15.4 wt% of hydrogen content, has been viewed as a promising candicate for hydrogen storage. However, it decomposes to H2, N2H4 and (NHBH2)2 after pyrolysis. The first example of metal hydrazinoborane, LiN2H3BH3, and its hydrazine borane adduct LiN2H3BH3.2N2H4BH3 were synthesized with their crystal structures successfully determined. The Li+ replaces one H on the middle N in the N2H4BH3 molecule, leading to the formation of [NH2NHBH3]-. Metal hydrazinoboranes exhibit dramatically improved dehydrogenation over the pristine hydrazine borane (N2H4BH3) with nearly complete dehydrogenation at mild temperature range (50-225�C) and high purity of H2 release. Particularly, the extent and purity of H2 released from LiN2H3BH3 exceed the best performance reported for hydrolysis of HB with catalysts.

Metal hydrazinoboranes: Crystal structures and high-extent dehydrogenation

244th National Meeting (2012)

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