Urine can be converted into hydrogen gas which can then be used to power a fuel cell to run a vehicle on. Urine actually is better than water when it comes to making hydrogen...urea has twice the molecules of hydrogen compared to water and splits apart at lower voltages. The problem is collecting urine and separating it from water in waste management plants which adds to the costs. Methods to separate urine at the source (toilets) would have to be developed.. "Forget gas, batteries — pee is new power source Scientists can create cheap hydrogen from urine for use in fuel cells " "Urine-powered cars, homes and personal electronic devices could be available in six months with new technology developed by scientists from Ohio University. Using a nickel-based electrode, the scientists can create large amounts of cheap hydrogen from urine that could be burned or used in fuel cells. "One cow can provide enough energy to supply hot water for 19 houses," said Gerardine Botte, a professor at Ohio University developing the technology. "Soldiers in the field could carry their own fuel." Pee power is based on hydrogen, the most common element in the universe but one that has resisted efforts to produce, store, transport and use economically. Storing pure hydrogen gas requires high pressure and low temperature. New nanomaterials with high surface areas can adsorb hydrogen, but have yet to be produced on a commercial scale. Chemically binding hydrogen to other elements, like oxygen to create water, makes it easier to store and transport, but releasing the hydrogen when it's needed usually requires financially prohibitive amounts of electricity. By attaching hydrogen to another element, nitrogen, Botte and her colleagues realized that they can store hydrogen without the exotic environmental conditions, and then release it with less electricity, 0.037 Volts instead of the 1.23 Volts needed for water. One molecule of urea, a major component of urine, contains four atoms of hydrogen bonded to two atoms of nitrogen. Stick a special nickel electrode into a pool of urine, apply an electrical current, and hydrogen gas is released.