Can hydrogen be craked from water (for fuel) in a cars fuel tank, with current technolgy?
You can crack water into oxygen and hydrogen with a current of electricity. It is called electrolysis (“electro” for electricity and “lysis” for loosening or breaking apart, as in “analyze”.) You run a direct current, like from a battery, through the water. Hydrogen would bubble off the positive lead or cathode, and oxygen from the anode. You can trap them separately so they don’t recombine. Then you have hydrogen you can use for fuel. It will burn, expanding and creating heat, more or less like gasoline. (Or you can recombine it with oxygen to generate that electricity back, using a fuel-cell.) Hopefully you compress the hydrogen, so your gas tank doesn’t have to be the size of a skyscraper. One problem with generating hydrogen that way is that it is very difficult to produce enough hydrogen on demand to handle rapid acceleration and any other transient demands. (See generally,
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