In cutting torches, it's more usually oxygen and ethyne. (oxyacetylyne [sp?]).
And what are you talking about here:
as for "Fuel cells" LOL, why suffer the losses used in energy conversion? why not use it neat, and bypass all the charging and losses used in: Heat, EM,RF etc,,,
why not cut to the chase and use existing tech and just modify it a bit
My personal response to that would be 'whut?'
In addition, I never said it was just used in rocketry, just the ideas have been thought of before.