hydrogen at high pressure, a recent innovation that has doubled the driving range of the cars says ted lipman director of the sustainability research center. >> what's very different now is we're able to store a lot mof hydrogen on the vehicle because we've gone to higher storage pressures, 250 or even 300 miles. >> most battery electric cars can only travel 80 or so miles before needing recharged. a fuel cell car also needs electricity to power the motor but here it's made on board from hydrogen. >> here is a fuel cell stack very similar to the type you would see in a fuel cell powered car. each cell has a special membrane material in the middle that splits the hydrogen molecules into protons and electrons. the protons are now ions that can go through this material but the electrons cannot. >> so the electrons go around the membrane and generate electricity. oxygen binds with the electrons and ions to produce water and heat, the only emissions. but like electric cars, fuel cell cars still need a fuel source. >> hydrogen fuel cells vehicles can be zero emission vehicles. the only way is to us