Hydrazine borane (N₂H₄BH₃, HB) is considered as a highly promising hydrogen storage material due to its high hydrogen content (15.4 wt%), easy preparation, and good physical and chemical properties. Hydrogen can be produced from hydrazine borane via pyrolysis, methanolysis and hydrolysis reaction. Especially, a promising approach for complete hydrogen production from N₂H₄BH₃ is by hydrolysis of the BH₃ group and selective decomposition of the N₂H₄ moiety of N₂H₄BH₃, corresponding to a theoretical gravimetric hydrogen storage capacity (GHSC) of 10 wt% for the system N₂H₄BH₃-3H₂O. The GHSC of N₂H₄BH₃ is much higher than those of benchmark hydrogen storage systems NaBH₄-4H₂O (7.3 wt%), NH₃BH₃-4H₂O (5.9 wt%), and N₂H₄·H₂O (8.0 wt%). The suitable catalyst is essential for complete hydrogen generation from N₂H₄BH₃. In this paper, the synthesis and characterizations of hydrazine borane are briefly introduced. The developments of catalytic systems for hydrogen production from hydrolysis of the BH₃ group and dehydrogenation of the N₂H₄ moiety of hydrazine borane at mild conditions are significantly reviewed. Moreover, the mechanism of hydrogen production from hydrazine borane is concisely analyzed and the application prospects of hydrazine borane are also remarked in this review.

Contents
1 Introduction
2 Synthesis and characterization of hydrazine borane
2.1 Synthesis
2.2 Molecular and structural analyses
3 Dehydrogenation of hydrazine borane
3.1 Hydrolysis of the BH₃ group of hydrazine borane
3.2 Hydrolysis of the BH₃ group and dehydrogenation of the N₂H₄ moiety of hydrazine borane
3.3 Reaction mechanism of complete dehydrogenation of hydrazine borane
4 Conclusion