期刊
DALTON TRANSACTIONS
卷 48, 期 4, 页码 1314-1321出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04720k
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资金
- National Natural Science Foundation of China [21805046]
- Public Welfare Research and Capacity Building Project of Guangdong [2015A010105028]
- Open Fund of the Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials
- Project of One-Hundred Young Talents of Guangdong University of Technology [220413551]
- PolyU Departmental General Research Grant [G-UADK]
In this study, the positive effects and dual roles of SiB4 on the dehydrogenation and rehydrogenation performance of the LiBH4-SiB4 system are reported. Characterizations were performed through temperature programmed desorption mass spectrometry (TPD-MS), isothermal kinetics measurements, and XRD and FTIR analyses. For the hydrogen desorption from LiBH4, SiB4 played the role of a catalyst to kinetically facilitate the structural destabilization of LiBH4 and its intermediate phase Li2B12H12. Accordingly, a dehydrogenation capacity of 2.24 at. H/f.u. LiBH4 (close to 10.3 wt% H) was attained at a relative temperature of 350 degrees C. For hydrogen absorption to generate LiBH4, SiB4 was unexpectedly found to act as a reactant to thermodynamically improve the rehydrogenation process by reacting with LiH under moderate conditions of 10 MPa H-2 and 400 degrees C, and a superior reversible capacity of 2.16 at. H/f.u. LiBH4 was achieved. These experimental results remind us to take into account the explicit role(s) of the employed components during the dehydrogenation and rehydrogenation reactions when designing a desirable LiBH4-based system.
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