RE:RE:I'm sorry but....Seems you contradict yourself here. Yes, efficiency can be improved but not to the point where output is greater than input. Where is the extra energy coming from?
Hydrogen is an energy carrier not a primary source and there are always losses in the conversion back and forth.
IvanVanBeethoven wrote: This doesn't violate the laws of thermodynamics. This is about making an already existing system more efficient. In particular, making the electrolysis of water more efficient, so that the output of energy is significantly greater than the input.
Compare it to making the energy consumption of a car more efficient. In theory, all energy lost through conversion into heat can be converted back into potential energy: think of the friction of the tyre surface with the road surface, friction during braking, engine heat, etc.