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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 6LiBH4 + CaH2 composite with NbF5 has been studied between 350 and 500 °C after dehydrogenation at 450 °C. The composite exhibits the best rehydrogenation feature at 450 °C in terms of the overall rehydrogenation rate and the amount of absorbed hydrogen. It is found that about 9 wt%hydrogen is absorbed at 450 °C for 12 h. Up to 10 dehydrogenation–hydrogenation cycles have been carried out for the composite. It is demonstrated that 6LiBH4 + CaH2 with 15 wt%NbF5 maintains a reversible hydrogen storage capacity of about 6 wt%at 450 °C after a slight degradation between the 1st and 5th cycles. The addition of NbF5 seems to improve the cycle properties by retarding microstructural coarsening during cycles.


Page:
6578-6582


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