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Rehydrogenation and cycle studies of LiBH4–CaH2 composite

Author:
Jae-Hag Lim   Jae-Hyeok Shim   Young-Su Lee   Jin-Yoo Suh   Young Whan Cho   Joonho Lee  


Journal:
International Journal of Hydrogen Energy


Issue Date:
2010


Abstract(summary):

Rehydrogenation behavior of 6LiBH 4 + CaH 2 composite with NbF 5 has been studied between 350 and 500degC after dehydrogenation at 450degC. The composite exhibits the best rehydrogenation feature at 450degC in terms of the overall rehydrogenation rate and the amount of absorbed hydrogen. It is found that about 9 wt% hydrogen is absorbed at 450degC for 12 h. Up to 10 dehydrogenation-hydrogenation cycles have been carried out for the composite. It is demonstrated that 6LiBH 4 + CaH 2 with 15 wt% NbF 5 maintains a reversible hydrogen storage capacity of about 6 wt% at 450degC after a slight degradation between the 1st and 5th cycles. The addition of NbF 5 seems to improve the cycle properties by retarding microstructural coarsening during cycles. [All rights reserved Elsevier].


Page:
6578-6582


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