PrBaFe2O5+delta promising electrode for redox-stable symmetrical proton-conducting solid oxide fuel cells

Abstract

The proton conduction behavior and electrochemical performance of PrBaFe2O5+delta (PBF) are firstly studied for use as promising anode materials in symmetrical proton-conducting solid oxide fuel cells (PCFCs). This study focuses on the investigation of protonic defect formation in PBF and its properties as an electrode, including its chemical stability, electrochemical performance and redox stability. PBF is found to have proton conductivity at intermediate temperatures, which contributes to improved hydrogen oxidation reaction and water formation reaction at the anode and cathode, respectively. Hence, the symmetrical PCFC exhibits a peak power density of 301 mW.cm(-2) and total resistance of 0.77 Omega.cm(2) at 700 degrees C. Further, it shows excellent redox-cycle stability upon cycling between fuel and air under a current load. The electrochemical analysis and redox cycling tests of the PBF anode demonstrate that PBF is an attractive candidate for alternative material for symmetrical PCFCs.