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With a catalyst to help the process along, sodium borohydride can be changed to sodium borate. This requires water as a reactant and also produces hydrogen as a product.
sodium borohydride + water -> sodium borate + hydrogen gas NaBH4 + 2H2O -> NaBO2 + 4H2
The reverse will not happen without energy to help it along, so simply adding hydrogen won't do the trick.
One way: Methane + sodium borate + heat -> sodium borohydride + carbon dioxide. CH4 + NaBO2 + heat -> NaBH4 + CO2 this is done at 900 degrees celsius.
There is a lot of research being done to find a simpler and more effecient way to recycle sodium borate into sodium borohydride. If we could find a simple, energy efficient, way, Sodium borohydride could be used effectively in hydrogen powered cars. Sodium borohydrate is preferrable to hydrogen gas because it is not flammable, unlike the gas.
Mellennium Cell has announced a more efficient process, which may be the answer, but I am not aware of what it involves.
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