There are several types of Fuel Cell and they all have practical applications as well as advantages and disadvantages. 

• Polymer Eceltrolyte Membrane (PEM) - fuel cell using a solid polymer membrane. This polymer membrane used as its electrolyte
• Alkaline (AFC) -  consume hydrogen and pure oxygen producing electricity
• Phosphoric Acid (PAFC) - fuel cell consists of concentrated phosphoric acid (H3PO4)
• Molten Carbonite (MCFC) - fuel cell using a molten carbonate electrolyte
• Solid Oxide (SOFC) - fuel cell using electrolyte which is a solid and typically nonporous metal oxide (ZrO2) treated with Y2O3

Fuel Cells use hydrogen which exists in an unlimited quantity. It is renewable, clean burning with water as bi-product. It generates more power when compared to hydrocarbon based fuels. It burns at lower temperatures allowing for less heat.