Abstract
A cubic perovskite oxide SrFe0.7Cu0.3O3-δ (SFC) is investigated as a novel cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). The average thermal expansion coefficient (TEC) of SFC is close to that of typical Ce0.9Gd0.1O1.95 (CGO) electrolyte. The electrical conductivity of SFC sample reached 25–54S cm−1 over the temperature range of 500–800°C. According to analysis results of AC impedance spectroscopy and DC polarization measurement, the polarization resistance (Rp) of SFC as cathode material on CGO electrolyte was successfully reduced to 0.14Ω cm2 at 700°C in air. Two main oxygen reduction reaction (ORR) processes are identified in accordance with the oxygen partial pressure dependence of Rp, in which the rate limiting step for the ORR is the oxygen ion transfer within the bulk electrode and/or from electrode to CGO electrolyte through the triple phase boundary (TPB). The excellent electrochemical performance indicated that SFC can be a promising cathode material for IT-SOFCs.
Published Version
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