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Second Law of Thermo Says Hydrogen Power Can't Work

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Submitted By jerics
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I am amused when I read popular press articles that tout hydrogen-powered vehicles as among the solutions for non-polluting transportation in the future. It is true that lots of energy is released when hydrogen combines with abundant, free atmospheric oxygen, and that the only sidestream output is water vapor.

Unfortunately there's no place to get free hydrogen for free. This is maddening, because a virtually inexhaustible supply of the stuff is right out there in plain sight of everybody, and has been since before our ancestors wiggled out of the oceans. Too bad it's 93 million miles away.

Here on earth, there are vast stores of hydrogen in plain sight too -- in the oceans, lakes, rivers and clouds. Too bad it's already combined with oxygen and other elements.

Elemental hydrogen is actually rather easy to obtain. Electrolysis of water splits apart the hydrogen and oxygen, which can be collected and stored. And it is pretty easy also to strip elemental hydrogen off of hydrocarbons, for example natural gas, which is mostly methane (CH4).

The trouble is that electrolysis of water requires an electricity source. Taking that electricity through the electrolysis - free hydrogen - oxidation - water vapor loop wastes quite a bit of energy. And it's way more efficient simply to burn the hydrocarbons to release their potential energy than it is to go through the hydrogen loop there.

If we could send tankers to the sun and back for free, hydrogen power would answer all our wishes for non-polluting energy sources. There again, if we were smart enough to design tankers that could make 186 million mile round trips for free, we wouldn't have to do it.

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