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Clean electricity makers

Fuel cells have also been around for a while. They create electricity from the reaction between oxygen and hydrogen fuel - the only waste product is clean water.

The main problem with fuel cells is size. Nanotechnology is helping to squeeze a large number of reactions into a very small space as well as improving the catalysts they need to work.

And scientists are now looking beyond non-renewable natural gas to water as a possible alternative source of hydrogen fuel.



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Fuel cells create electricity from the reaction between oxygen and hydrogen fuel and the only waste product is clean water.
Fuel cells create electricity from the reaction between oxygen and hydrogen fuel and the only waste product is clean water.
Image: VW Press Archive

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