by 
The Curious Bag
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<h4 class="dechead">On One Hand: Hydrogen Cars Do Work
A number of major automobile manufacturers have tested hydrogen fuel cell technology. There are some limited real-world tests going on in selected markets. Hydrogen-powered cars emit zero hydrocarbons, only water vapor. The fuel cells are used to generate electricity, which powers electric motors that replace a standard gasoline engine.
On the Other: There are Problems
Hydrogen fuel cells are expensive to produce; they cost between $1,000 and $3,000 per kilowatt to produce. One popular hybrid car has a 70-kilowatt motor. An all-electric sports car has a 215-kilowatt motor; that makes building the vehicles very expensive.
Bottom Line
Hydrogen works in cars, but it isn't very practical. There currently isn't a wide-spread fueling network for hydrogen vehicles, so even if you could build a car at a cost-effective price, you couldn't drive it very far because there aren't enough fueling stations.
Source:
HydrogenCarsNow.com: Hydrogen Cars
NanoWerk.com: Nanotechnology Can Clean Up Hydrogen's Dirty Little Secret
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