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- W2894425775 abstract "Lithium borohydride (LiBH4) is a potential high-capacity hydrogen storage material but is limited by its high thermal stability and poor reversibility. Nanostructured hexagonal boron nitrides (h-BNs) with thin-layer (TL-BN) and nanoporous (NP-BN) structures have been prepared by treating h-BN in a hydrolysis process of LiBH4 and then mixing with LiBH4 by ball-milling to investigate their catalyzing effect on dehydrogenation and rehydrogenation. Nanostructured h-BN, in particular NP-BN, with an average pore size of 40 nm, significantly promotes the dehydrogenation kinetics, dehydrogenation capacity, and reversibility of LiBH4. For a LiBH4 + NP-BN (mole ratio 1:0.3) composite, the dehydrogenation capacity reaches 13.9 wt % for LiBH4 at 400 °C, which is very close to its theoretical one. The cycling capacity could remain stable at ∼7.6 wt % with rapid kinetics after de/rehydrogenation cycles under 10 MPa of hydrogen at 400 °C. The improved de/hydrogenation performance of LiBH4 depends on the nanoconfinement structure of LiBH4 in NP-BN. After dehydrogenation, a lithium-intercalated h-BN(LixBN) nanocrystal was formed by the reaction of h-BN and LiH. This LixBN nanocrystal confined the dehydrogenation products of the amorphous structure during dehydrogenation. Thus, this nanocrystal-confine-amorphous structure destabilizing LiH and benefiting the rehydrogenation and reversible capacity of the composite." @default.
- W2894425775 created "2018-10-05" @default.
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- W2894425775 date "2018-09-26" @default.
- W2894425775 modified "2023-10-17" @default.
- W2894425775 title "Achieving High Dehydrogenation Kinetics and Reversibility of LiBH<sub>4</sub> by Adding Nanoporous h-BN to Destabilize LiH" @default.
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- W2894425775 doi "https://doi.org/10.1021/acs.jpcc.8b07086" @default.
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