Hardly any, if any at all. Some have been developed and tested, but car manufacturers won’t get them rolling out and on sale until 2015 at the earliest. They may not become profitable and popular until 2020. However, the research is still happenign and many car companies are looking toward hydrogen as a future fuel source.
As valorie mentioned, electric cars may not become popular at all. The one and only advantage that hydrogen-powered cars have over battery electric vehicles is that they can be refueled quickly for long trips. However, they are far less efficient. It takes a lot more energy to split hydrogen than it takes to simply transfer electrons between battery cells. Personally, I believe that Battery Electric Vehicles are the way to go for most of our transportation needs and Waste Vegetable Oil (WVO) can be used for longer distances.
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