Types of Fuel Cell Electrolytes

• Phosphoric Acid

• Proton Exchange Membrane

• Molten Carbonate

• Solid Oxide

• Alkaline

• Direct Methanol Fuel Cells

(EPA 1994)

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The design of electrodes, for example, and the materials used to make them depend on the electrolyte. Today, the main electrolyte types are alkali, molten carbonate, phosphoric acid, proton exchange membrane (PEM) and solid oxide. The first three are liquid electrolytes; the last two are solids.