I was especially entertained by the earlier claim in this thread about perpetual motion. There is no way (according to the laws of thermodynamics and they are called laws not theories!) to burn a fuel consuming energy to produce energy to run the process. If you believe it can be done just reach down and grab your ankles and pull yourself up into the air.
An alternator will not produce enough electricity to generate enough hydrogen to run the engine to turn the alternator.
All systems have losses, no one in centuries of trying has ever perfected perpetual motion. The laws of thermodynamics prevail.
Any idiot can stick two conductors into less than perfectly clean water and get hydrogen and oxygen gas. Many a grade school kid has done it. If you use DC instead of AC you get a separate supply of oxygen and hydrogen. With soap in the water you can get bubbles of hydrogen that rise up quite a ways before eventually popping. Invert a jar full of water and let the bubbles displace the water. When full you have a bottle of hydrogen or oxygen. If you use AC you will have an explosive mixture that can blow up and scatter glass for quite a ways.
None of this is new, or useful in fueling a vehicle.
Pat