Electrochemical performance of double perovskite Pr2NiMnO6 as a potential IT-SOFC cathode. (5th October 2015) - Li, Huan
Abstract: Double perovskite oxide Pr2 NiMnO6 is evaluated as a potential cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The reactivity test indicates that no reaction occurs between Pr2 NiMnO6 and CGO at 1200 °C in air. The thermal expansion coefficients (TEC) of Pr2 NiMnO6 are 10.6 × 10 −6 K −1 in air and 11.5 × 10 −6 K −1 in nitrogen atmosphere within a temperature range of 100–800 °C. The electrochemical properties of Pr2 NiMnO6 cathode are characterized by ac impedance and dc polarization methods, respectively. The lowest area specific resistance (ARS) is 0.38 Ω cm 2 at 700 °C in air. The dependence of ASR with oxygen partial pressure indicates that the charge transfer process is the rate-limiting step for oxygen reduction reaction on Pr2 NiMnO6 cathode. Highlights: B-site ordered double perovskite material Pr2 NiMnO6 was successfully prepared. Pr2 NiMnO6 exhibits high chemical stability and comparable thermal expansion behavior with CGO electrolyte. The lowest area specific resistance is 0.38 Ω cm 2 at 700 °C. The reaction rate limiting step is identified as a charge transfer process.