Electrochemical performance of double perovskite Pr2NiMnO6 as a potential IT-SOFC cathode

Double perovsldte oxide Pr2NiMnO6 is evaluated as a potential cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The reactivity test indicates that no reaction occurs between Pr2NiMnO6 and CGO at 1200 degrees C in air. The thermal expansion coefficients (TEC) of Pr2NiMnO6 are 10.6 x 10(-6) K-1 in air and 11.5 x 10(-6) K-1 in nitrogen atmosphere within a temperature range of 100-800 degrees C. The electrochemical properties of Pr2NiMnO6 cathode are characterized by ac impedance and dc polarization methods, respectively. The lowest area specific resistance (ARS) is 0.38 Omega cm(2) at 700 degrees 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 Pr2NiMnO6 cathode. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.