Fabrication, characterization, and performance of Yb DSB ternary compounds for IT ‐ SOFC applications

Abstract (Yb ₂ O ₃ ) _x (Dy ₂ O ₃ ) _y (Bi ₂ O ₃ ) _{1− x−y} (0.04≤ x+y ≤0.20) powders ( x Y b y DSB ) were synthesized by modified sol‐gel Pecchini method. The powders were characterized for structural, surface morphological, thermal, and electrical properties and power density measurements by means of X‐ray diffraction ( XRD ), scanning electron microscopy ( SEM ), differential thermal analysis/thermal gravimetry ( DTA / TG ), and impedance spectroscopy, respectively. Lattice parameters and crystalline size of δ ‐ phase of Yb ₂ O ₃ ‐ and Dy ₂ O ₃ ‐doped Bi ₂ O ₃ samples were calculated from the X‐ray diffraction data. Surface and grain properties of the related phases were determined by SEM analysis. In the investigated system, the maximum electrical conductivity was observed as σ=0.954 S cm ⁻¹ for 6% mol Yb ₂ O ₃ and 6% mol Dy ₂ O ₃ at 800°C among all δ‐Yb DSB systems. Cathode supported electrochemical cell was fabricated and 6Yb6DSB was used as the electrolyte. Maximum power density of single cell with an active area of 1.5 cm ² is 72.50 mW/cm ² at 700°C.