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- W2154604032 abstract "NaBH4 is an interesting hydrogen storage material for mobile applications due to its high hydrogen content of 10.8 wt%. However, its practical use is hampered by the high temperatures (above 500 °C) required to release the hydrogen and by the non reversibility of the hydrogen sorption. In this study, we show that upon heating to 600 °C, bulk NaBH4 decomposed into Na and Na2B12H12, releasing the expected 8.1wt% of hydrogen. Nanosizing and confinement of NaBH4 in porous carbon resulted in much faster hydrogen desorption kinetics. The onset of hydrogen release was reduced from 470 °C for the bulk to below 250 °C for the nanocomposites. Furthermore, the dehydrogenated nanocomposites were partially rehydrogenated to form NaBH4, with the absorption of about 43% of the initial hydrogen capacity at relatively mild conditions (60 bar H2 and 325 °C). Reversibility in this system was limited due to partial loss of Na during dehydrogenation. The dehydrogenated boron compounds were almost fully rehydrogenated to NaBH4 (98%) when extra Na was added to the nanocomposites. To the best of our knowledge, this is the first time that reversibility for NaBH4 has been demonstrated." @default.
- W2154604032 created "2016-06-24" @default.
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- W2154604032 date "2011-01-01" @default.
- W2154604032 modified "2023-09-30" @default.
- W2154604032 title "Reversibility of the hydrogen desorption from NaBH4 by confinement in nanoporous carbon" @default.
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- W2154604032 doi "https://doi.org/10.1039/c1ee01481a" @default.
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