The device known as a fuel cell produces electrical energy by combining hydrogen and oxygen. Functioning in a similar way to a battery, a fuel cell converts the chemical potential energy of hydrogen and oxygen gas into an electrical charge.
Within a fuel cell, a hydrogen anode is separated from an oxygen cathode via an electrolytic solution. The reaction of the two gases combing to form water, H2O, creates a flow of electrons. This electricity can then be harnessed to power motion. Fuel cells are a commonly proposed fuel for future automobiles as the cells produce only water vapour as emissions.