Abstract
Boron- and nitrogen-based materials have shown to be attractive for solid-state chemical hydrogen storage owing to gravimetric hydrogen densities higher than 10 wt% H. Herein, we report a new derivative of hydrazine borane N2H4BH3, namely lithium hydrazinidoborane ammoniate LiN2H3BH3·0.25NH3. It is easily obtained in ambient conditions by ball-milling N2H4BH3 and lithium amide LiNH2 taken in equimolar amounts. Both compounds react without loss of any H atoms. The molecular and crystallographic structures of our new compound have been confirmed by NMR/FTIR spectroscopy and powder X-ray diffraction. The complexation of the entity LiN2H3BH3 by some NH3 has been also established by thermogravimetric and calorimetric analyses. In our conditions, LiN2H3BH3·0.25NH3 has been shown to be able to release H2 at temperatures lower than the parent N2H4BH3 or the counterpart LiN2H3BH3. It also liberates non-negligible amounts of NH3 at temperatures lower than 100 °C. This is actually quite detrimental for chemical H storage, but alternatively LiN2H3BH3·0.25NH3 might be seen as a potential NH3 carrier.
Highlights
Hydrogen storage is one of the major obstacles restricting the development of an “economy of hydrogen energy”
In 2009, N2 H4 BH3 was re-discovered owing to its high gravimetric hydrogen density of 15.4 wt%
It was considered as being unsuitable for solid-state chemical H storage because of hazardous dehydrogenation properties [4]
Summary
Hydrogen storage is one of the major obstacles restricting the development of an “economy of hydrogen energy”. Many studies have been done to find new solutions, and particular attention has been paid to chemical H storage [1], and interestingly there has been new interest in old molecules and materials [2]. An example of this is hydrazine borane. In 2009, N2 H4 BH3 was re-discovered owing to its high gravimetric hydrogen density of 15.4 wt% It was considered as being unsuitable for solid-state chemical H storage because of hazardous dehydrogenation properties [4]
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