SrCo0.4Fe0.4Zr0.1Y0.1O3-δ, A new CO2 tolerant cathode for proton-conducting solid oxide fuel cells

CO2 poisoning is not a negligible issue for SrCoO3-delta 5 based materials, which limits their application as cathodes for solid oxide fuel cells (SOFCs). In this paper, iron, zirconium, and yttrium were co-doped into SrCoO3-delta to form a structurally stable cubic perovskite material, SrCo0.4Fe0.4Zr0.1Y0.1O3-delta (SCFZY). The CO2 adsorption-desorption on SCFZY was studied via X-ray diffraction and CO2 temperature-programmed desorption. The polarization resistance of the symmetric cell SCFZY vertical bar BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb)vertical bar SCFZY was tested in air containing 10 vol% CO2 to evaluate the SCFZY's CO2-tolerance as a SOFCs cathode. When applied as a SOFCs cathode in a cell with a proton-conducting electrolyte BZCYYb, SCFZY showed significant CO2-tolerance. The single-cell NiO-BZCYYb vertical bar BZCYYb vertical bar BZCYYb-SCFZY showed an output with a maximum power density of 679 mW cm(-2) at 700 degrees C and good durability of 500 h. The SCFZY cathode also displayed better CO2-tolerance than the Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) cathode for IT-SOFCs. (c) 2021 Elsevier Ltd. All rights reserved.