Solid oxide fuel cells are a type of fuel cells which uses a solid oxide electrolyte to conduct negative oxygen ions from the cathode to the anode. The electrochemical oxidation of the oxygen ions with hydrogen or carbon monoxide thus occurs on the anode side. They operate at very high temperatures, typically between 500 and 1,000 °C. At these temperatures, SOFCs are not vulnerable to carbon monoxide poisoning and tolerant to intake Sulfur to a limited level. Because of these high temperatures, light hydrocarbon fuels, such as methane, propane, and butane can be internally reformed within the anode.
SOFCs have a wide variety of applications like APU, CHP with outputs from Watts to MW.
Anode – Fuel Electrode: H2 + O2- →H2O + 2e-
Cathode – Air Electrode: 1/2 O2 + 2e- → O2-