Li2(NH2BH3)(BH4)/LiNH2BH3: The first metal amidoborane borohydride complex with inseparable amidoborane precursor for hydrogen storage |
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| Authors: | Junhong Luo Hui Wu Wei Zhou Xiangdong Kang Ping Wang |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102, USA;3. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, USA |
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| Abstract: | A novel lithium amidoborane borohydride complex, Li2(NH2BH3)(BH4), was synthesized using mechanochemical method and its crystal structure was successfully determined by a combination of X-ray diffraction (XRD) analysis and first-principles calculations. Interestingly, this compound does not exist as a pure phase, but requires almost equivalent amount of amorphous LiAB as a stabilizing agent. In this paper, we report a careful study of the structure, property, and dehydrogenation mechanism of the 1:1 Li2(NH2BH3)(BH4)/LiAB composite. This composite can release ∼8 wt% H2 at 100 °C via a two-step dehydrogenation process, with dehydrogenation kinetics better than the parenting phases. The composite and its dehydrogenation products were characterized by the combined XRD, Fourier transformation infrared (FTIR) spectroscopy, and solid-state 11B MAS NMR techniques. Selective deuterium labeling was performed to elucidate a reaction sequence for the hydrogen release by analyzing the released gases. |
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| Keywords: | Hydrogen storage Dehydrogenation Ammonia borane Amidoborane Lithium borohydride |
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