Synthesis and characterization of PrBa_0.5Sr_{0 ?5}Co_2-xFe_xO₅₊ (x=0.5, 1.0, 1.5, 2.0) as oxygen electrode for proton-conducting solid oxide cells

As clean energy conversion devices with the functions of power generation and hydrogen evolution, solid oxide cells (SOCs) are facing the obstacle of insufficient catalytic activity of traditional electrode materials under the trend of lower operation temperature. Here a double-perovskite material PrBa0.5Sr0 center dot 5Co2-xFexO5+delta (x=0.5, 1.0, 1.5, 2.0) is reported and its application as oxygen electrode of symmetrical cells on the proton conductor BaZr0.1Ce0.7Y0.1Yb0.1O3- delta (BZCYYb1711) is investigated. The tests are carried out under atmospheres with different water content (0, 20% and 40%), showing the influence of Fe/Co molar ratio on the crystal structure, conductivity, electrochemical properties and micro morphology of PBSCF series materials. With the increasing of Fe substitution content, the