Uhhhhhh...No. Hydrogen must be manufactured...only practical non-polluting way would be to construct many more nuke plants, (not that I am against that)...but if you are going to do that, just invest the $ in new battery technology and go with electric cars...(skip the hydrogen "Middleman").
Hydrogen FUEL cells are used....Check out Ballard Fuel Cells here: http://www.ballard.com/be_informed/fuel_cell_technology