Here's a bit more info on splitting water.
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It takes 1.24 volts to split water at 77 degree F (25C). A conventional electrolyser operates at 167 to 176 degree F (75 to 80 C) with a current density of around 2,000 amps per square meter. Voltage requirements fall with in 1.9 to 2 volt range. The required energy of input is 4.8 kWh per cubic meter of hydrogen produced.
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Got the above info out of the book Fuel from Water by Michael A. Peavy.
The best part I like is the free water. You can make your own "sort" of fuel anytime you want. With a bit of wind turbine power you could make your own free fuel so to speak. Second law of thermodynamics be damed.
Bernd