Magnesium borohydride Mg(BH4)2 for energy applications: A review
(2023) Journal of Materials Science & Technology : an international journal in the field of materials science — Vol. 161, p. 170-179 (2023)
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- Authors
Li, Xiao 
Yan, Yigang Jensen, Torben R. Li, Hai-Wen
- Abstract
- Mg(BH4)2 with several polymorphs, known as a high capacity (14.9 wt.%) hydrogen storage material, has become more intriguing due to the recently found new functions of gas physisorption and ionic conductivity. Here we review the state-of-the-art on the energy related functions of Mg(BH4)2. Mg(BH4)2 tends to form the stable intermediate [B12H12]2− when the dehydrogenation temperature is above 400 °C, the strong B-B bonding of which makes the rehydrogenation condition very harsh. In contrast, lower borane intermediate [B3H8]2− facilitates the rehydrogenation even at a mild condition of 100 °C, suggesting the possibility of reversible hydrogen storage in Mg(BH4)2. The porous polymorph γ-Mg(BH4)2 shows attractive gas adsorption properties in view of its unique hydridic surface and pore shape, and potentially can be applied in hydrogen adsorption and Kr/Xe selectivity. A new diffraction-based adsorption methodology was developed to characterize adsorption thermodynamics and kinetics of γ-Mg(BH4)2, providing a novel idea for the characterization of crystalline porous materials. Moreover, the potential of Mg(BH4)2 as an electrolyte is discussed in the last part. Mg(BH4)2·THF/DME acts as a liquid electrolyte in Mg-batteries, while anion substituted or neutral molecule derivatives of Mg(BH4)2 can act as solid-state electrolyte.
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Citations
Li, X., Yan, Y., Jensen, T. R., Filinchuk, Y., Dovgaliuk, I., Chernyshov, D., He, L., Li, Y., & Li, H.-W. (2023). Magnesium borohydride Mg(BH4)2 for energy applications: A review. Journal of Materials Science & Technology : an international journal in the field of materials science, 161, 170-179. https://doi.org/10.1016/j.jmst.2023.03.040 (Original work published 2023)