Reversibility of the hydrogen desorption from NaBH4 by confinement in nanoporous carbon

• DOI: 10.1039/c1ee01481a
• Publication Date: 2011-08-08T14:00:41Z
• Authors: Peter Ngene; Roy van den Berg; Margriet H. W. Ve...; Krijn P. de Jong; Petra E. de Jongh
• Keywords: Carbon fibers; Cryo-adsorption

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