Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 1, Pages 893-903Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19287
Keywords
LiBH4; hydrogen storage; kinetics; cyclic stability; reversibility; catalysis
Funding
- National Key Research and Development Program of the Ministry of Science and Technology of PR China [2018YFB1502103]
- National Natural Science Foundation of PR China [51571175, 51371158, U1601212, 51701092]
- Natural Science Foundation of Jiangsu Province [BK20160419]
- Science and Technology Plan of Nantong City [JC2018111]
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LiBH4 is a high-capacity hydrogen storage material; however, it suffers from high dehydrogenation temperature and poor reversibility. To tackle those issues, we introduce a new LiBH4-based system with in situ formed superfine and well dispersed Li3BO3 and NbH as co-reactants. Those are synthesized by the addition of niobium ethoxide [Nb(OEt)(5)] to LiBH4, heat treatment of the mixture, and then hydrogenation, where Li3BO3 and NbH are generated from the reaction of Nb(OEt)(5) and LiBH4. After optimization, the system with a normalized composition of LiBH4-0.04(Li3BO3 + NbH) in molar fraction shows superior hydrogen storage reversibility and kinetics. The initial and main dehydrogenation temperatures of the system are 200 and 90 degrees C lower than those of the pristine LiBH4, respectively, and 8.2 wt % H-2 is released upon heating to 400 degrees C. A capacity of 7.2 wt % H-2, corresponding to a capacity retention of 91%, is sustained after 30 cycles in an isothermal cyclic regime of dwelling at 400 degrees C for 60 min for dehydrogenation and dwelling at 500 degrees C and 50 bar H-2 pressure for 20 min for hydrogenation. Such a high cyclic stability for a LiBH4-based system has never been reported to date. The in situ introduced Li3BO3 and NbH have a synergistic catalysis effect on the improvement of the hydrogen storage performance of LiBH4, showing highly effective bidirectional action on both dehydrogenation and hydrogenation.
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