The fuel which may be an option that fuel cells can run on would be ETHANOL. It is so because of the formula ethanol has (C2H5OH). Hydrogen is used in this chemical reaction (catalyst) so it couldn´t be an option. Uranium is a heavy metal, difficult to be split in smaller pieces and not appropriate in this type of reaction. Crude oil does not serve for this kind of electrolitic reaction, which happens in water.