Table 2.

Comparison of types of fuel cells under different electrolyte utilization conditions.

Type of cells	Temperature (°C)	Electrolyte	Oxidant	Fuel	Efficiency (%)
Alkaline	60–90 °C	Potassium hydroxide	Oxygen	Pure hydrogen	50–55
Molten carbonate	600–700 °C	Molten salt	Oxygen	CO/Hydrogen	45–55
Solid oxide	500–1000 °C	Zirconia -based Ceramic	Oxygen	Natural gas	45–60
Direct methanol	60–200 °C	Polymer	Oxygen	Methyl alcohol	40–55
H3PO4	150–200 °C	Phosphoric acid	Oxygen	Hydrocarbons	40–55
Sulfuric acid	80–90 °C	Sulfuric acid	Oxygen	Impure hydrogen	40–56
Proton-exchange membrane	50–80 °C	Polymer with Proton-exchange membrane	Oxygen	Hydrogen, methanol	40–55
Protonic ceramic	600–700 °C	Thin membrane of Barium Cerium Oxide	Oxygen	Hydrocarbons	45–60