Phase Stability, Electrochemical Activity, and Accelerated Test for SOFC Cathodes

Monday, 2 October 2017: 11:40
National Harbor 7 (Gaylord National Resort and Convention Center)
E. Dogdibegovic, Y. Wang, and X. D. Zhou (University of South Carolina)
In this presentation, I will use the cathode for solid oxide fuel cells as an example to elucidate the relationship between the phase stability and electrochemical activity. The presentation will focus on praseodymium nickelate (Pr2NiO4), an active electrode for oxygen reduction reaction. Pr2NiO4, however, exhibits phase transition at elevated temperatures or under an electrochemical operation to form PrOx and higher ordered nickelate phase. We will discuss multiple strategies to improve the phase stability via intrinsic dopants and microstructure modification. More importantly, the knowledge gained has been translated to develop accelerated test protocols for nickelate- and perovskite-based cathodes.