The cathode, being the site for the oxygen reduction reaction (ORR), is highly instrumental in determining the performance of a cell. As electrons are necessary for the reduction of oxygen molecules, superior electronic conductivity of the cathode material is the primary requirement. Low or no chemical reaction with other cell components, compatible thermal expansion coefficient (TEC), and high catalytic activity for the reduction of an oxygen molecule are other requirements for the cathode material. The porous microstructure of the cathode material further enhances the ORR as it ensures the access of oxygen molecules to the cathode surface, and thus extends the active region beyond the restricted triple phase boundary (TPB).