Abstract
Hydrazine borane N2H4BH3 and alkali derivatives (i.e., lithium, sodium and potassium hydrazinidoboranes MN2H3BH3 with M = Li, Na and K) have been considered as potential chemical hydrogen storage materials. They belong to the family of boron- and nitrogen-based materials and the present article aims at providing a timely review while focusing on fundamentals so that their effective potential in the field could be appreciated. It stands out that, on the one hand, hydrazine borane, in aqueous solution, would be suitable for full dehydrogenation in hydrolytic conditions; the most attractive feature is the possibility to dehydrogenate, in addition to the BH3 group, the N2H4 moiety in the presence of an active and selective metal-based catalyst but for which further improvements are still necessary. However, the thermolytic dehydrogenation of hydrazine borane should be avoided because of the evolution of significant amounts of hydrazine and the formation of a shock-sensitive solid residue upon heating at >300 °C. On the other hand, the alkali hydrazinidoboranes, obtained by reaction of hydrazine borane with alkali hydrides, would be more suitable to thermolytic dehydrogenation, with improved properties in comparison to the parent borane. All of these aspects are surveyed herein and put into perspective.
Highlights
Access to energy has been one of the most important events in recent human history
Hydrazine borane N2H4BH3 is under investigation for chemical hydrogen storage since the late 2010s when it was suggested as having a good potential in the field, especially as an alternative to ammonia borane NH3BH3
Hydrazine borane faces the same challenges as ammonia borane
Summary
Access to energy has been one of the most important events in recent human history. The world entered into a new era with technological development related to widespread use of coal in the 19th century. There is distinction between physical storage (i.e., cryo-adsorption) and chemical storage With the former, porous materials store molecular hydrogen in conditions (−196 °C and 10–120 bars of H2) that are milder than those for cryogenic liquid [4,5,6,7]. Since 2009, hydrazine borane and new derivative compounds, the alkali hydrazinidoboranes MN2H3BH3, have positioned themselves as being potential candidates for chemical hydrogen storage, focusing more and more attention This is the core topic of the present review, which for the first time aims at focusing on these materials, giving a timely and detailed overview about fundamentals, and tentatively discussing application prospects on the basis of the recent achievements
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