Which brings to mind a thread we had here a few months back on a discovery that a 60% copper and 40% nickel alloy was discovered to dissociate Molecular Hydrogen on contact. (Can anybody remember that thread?)
If this is so, a lot of energy may be provided by this mechanism and the rest may be provided by sparks which is 40% efficient in ionizing hydrogen. With this combination, it might be possible to reach breakeven or even exceed it by COP 6. Once again, my understanding may be simplistic as I am not a physicist, so I beg the group's indulgence. Jojo