A novel anode-supported stable BaCe0.7Ta0.1Y0.2O3? δ membrane prepared by all-solid-state process for solid oxide fuel cells

摘要

BaCe0.7Ta0.1Y0.2O3? δ (BCTY) and BaCe0.8Y0.2O3? δ (BCY) were synthesized by solid-state reaction method at 1,300 °C for 20 h. After being exposed in 3% CO2 + 3% H2O + 94% N2 at 700 °C for 20 h, the BCTY exhibited adequate chemical stability against carbonations while BCY decomposed into BaCO3 and CeO2. The BCTY showed the similar thermal expansion behavior to BCY from room temperature to 1,000 °C in air. The BCTY displayed a conductivity of 0.007 S/cm at 700 °C in humid hydrogen, lower than that of BCY (0.009 S/cm). A fuel cell with 10-μm thick BCTY membrane prepared through an all-solid-state process exhibited 1.004 V for OCV, 330 mW/cm2 for maximum output at 700 °C, respectively. Short-term test shows that the fuel cell performance does not degrade after 20 h.