Tailoring Electrochemical Property of Layered Perovskite Cathode by Cu‐doping for Proton‐Conducting IT‐SOFCs

Layered perovskite oxide YBaCuCoO5+x (YBCC) was synthesized by an EDTA-citrate complexation process and was investigated as a novel cathode for proton-conducting intermediate temperature solid oxide fuel cells (IT-SOFCs). The thermal expansion coefficient (TEC) of YBCC was 15.3 × 10−6 K−1 and the electrical conductivity presented a semiconductor-like behavior with the maximum value of 93.03 Scm−1 at 800 °C. Based on the defect chemistry analysis, the electrical conductivity gradually decreases by the introduction of Cu into Co sites of YBaCo2O5+x and the conductor mechanism can transform from the metallic-like behavior to the semiconductor-like behavior. Thin proton-conducting (BaZr0.1Ce0.7Y0.1Yb0.1O3–δ) BZCYYb electrolyte and NiO–BZCYYb anode functional layer were prepared over porous anode substrates composed of NiO–BZCYYb by a one-step dry-pressing/co-firing process. Laboratory-sized quad-layer cells of NiO-BZCYYb / NiO-BZCYYb / BZCYYb / YBCC with a 20 μm-thick BZCYYb electrolyte membrane exhibited the maximum power density as high as 435 mW cm−2 with an open-circuit potential (OCV) of 0.99 V and a low interfacial polarization resistance of 0.151 Ωcm2 at 700 °C. The experimental results have indicated that the layered perovskite oxide YBCC can be a cathode candidate for utilization as proton-conducting IT-SOFCs.

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