However, due to only heat and water being the by-products and for their high efficiencies, fuel cells are becoming credible candidates to provide energy for transport and other application but more research is still needed to improve the overall efficiency of fuel cells use cycle including the production of the fuel for the cells. In a PEM fuel cell an electrolyte membrane is sandwiched between two electrodes allowing protons to pass through it but at the same time it is impermeable to electrons