There is none and there never will be. Engines can run on hydrogen but they can't crack water into hydrogen and use the energy - that is a violation of the second law of thermodynamics and is called a perpetual motion machine of the second kind. It always takes far more energy to split water into hydrogen and oxygen than is available by combining the two again, whether it is used to power a combustion engine or to power a fuel cell. In fact, the cycle efficiency of electrolyzing water and burning it in an engine is a bit less than 2% efficient with any but the most exotic methods (with a high pressure fuel cell), in which case it can reach almost 30% efficiency.
Hydrogen fuel is used on some rocket engines, but way too expensive for automotive use.
Does a movie count? The Water Engine. I thought it was a good movie.
they have not solved the alloy problem yet the metal becomes brittle
There are engines like that, but..... They use more energy than they output..... not worth it for consumers.
I mean one that can remove the hydogen from water and use it as fuel? If not, will we see one in 100 years or so?
