[boris]

"A great way to store hydrogen i sto chemically combine it with oxygen. The hydrogen thus stored is nontoxic* and nonflammable, and can easily be liberated by the simple addition of elemental sodium, an element in non-toxic* table salt."

The problem is that the energy cost of making Na is greater than that recovered from burning the H2 evolved. Again a big storage battery. The interesting aspect to me is that density is a huge problem with H2; even as a liquid it is 11 times less dense than gasoline. In fact, it liberates less energy per unit mass than gasoline (but more per pound). So if H2 could be stored at densities approaching that of water or water ice, it may open up some applications.

--Boris

[coloradan]

I think you mean, it liberates less energy per unit volume but more per unit mass (~ pound).