Lithium hydrazinidoborane: A polymorphic material with potential for chemical hydrogen storage
(2014) Chemistry of Materials — Vol. 26, n° 10, p. 3249-3255 (2014)
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- Herein, we describe the synthesis and characterization (chemical, structural, and thermal) of a new crystal phase of lithium hydrazinidoborane (LiN2H4BH3, LiHB), which is a new material for solid-state chemical hydrogen storage. We put in evidence that lithium hydrazinidoborane is a polymorphic material, with a stable low-temperature phase and a metastable high-temperature phase. The former is called β-LiHB and the latter α-LiHB. Results from DSC and XRD showed that the transition phase occurs at around 90 °C. On this basis, the crystal structure of the novel β-LiHB phase was solved. The potential of this material for solid-state chemical hydrogen storage was verified by TGA, DSC, and isothermal dehydrogenations. Upon the formation of the α-LiHB phase, the borane dehydrogenates. At 150 °C, it is able to generate 10 wt % of pure H 2 while a solid residue consisting of polymers with linear and cyclic units forms. Reaction mechanisms and formation of bis(lithium hydrazide) of diborane [(LiN2H3)2BH2] +[BH4]- as a reaction intermediate are tentatively proposed to highlight the decomposition of β-LiHB in our conditions. © 2014 American Chemical Society.
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Moury, R., Demirci, U. B., Ban, V., Filinchuk, Y., Ichikawa, T., Zeng, L., Goshome, K., & Miele, P. (2014). Lithium hydrazinidoborane: A polymorphic material with potential for chemical hydrogen storage. Chemistry of Materials, 26(10), 3249-3255. https://doi.org/10.1021/cm500980b (Original work published 2014)