Development of Double-Perovskite Compounds as Cathode Materials for Low-Temperature Solid Oxide Fuel Cells†
This research was supported by the Mid-career Researcher Program (2013R1A2A2A04015706) funded by the Korea Government Ministry of Science, ICT and Future Planning and the Basic Science Research Program (2010-0021214) funded by the Ministry of Education through the National Research Foundation of Korea. It was also supported by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP; 20113020030060) grant funded by the Korea Ministry of Knowledge Economy.
Abstract
A class of double-perovskite compounds display fast oxygen ion diffusion and high catalytic activity toward oxygen reduction while maintaining excellent compatibility with the electrolyte. The astoundingly extended stability of NdBa1−xCaxCo2O5+δ (NBCaCO) under both air and CO2-containing atmosphere is reported along with excellent electrochemical performance by only Ca doping into the A site of NdBaCo2O5+δ (NBCO). The enhanced stability can be ascribed to both the increased electron affinity of mobile oxygen species with Ca, determined through density functional theory calculations and the increased redox stability from the coulometric titration.
