La_0.7Sr_0.3Al_0.7Ti_0.3O_3-δ Dual-Conductor Anode in SOFC for Co-Generation of Olefin and Electricity

The A- and B-site arrangement in ABO₃-type perovskite oxides enables them to be tailored for excellent catalytic performance, while also exhibiting both O^{2 -} and electronic conductivity, making them suitable as electrode materials for solid oxide fuel cells (SOFCs). This study introduces a novel double-conductor perovskite anode, La_0.7Sr_0.3Al_0.7Ti_0.3O_{3- δ}, designed to drive the oxidative coupling of methane (OCM) for the coproduction of valuable light olefins such as ethylene and propylene, while simultaneously enabling efficient power generation. The material is characterized for its structural stability and mixed conductivity using XRD, high-resolution HRTEM, and EIS. Based on these properties, the material is assembled into a cell as the anode to evaluate its electrochemical performance. The symmetrical cell employing La_0.7Sr_0.3Al_0.7Ti_0.3O_{3- δ} as the electrode demonstrates an area-specific impedance of 0.06 Ω cm² at 850°C under a CH₄ atmosphere, indicating superior catalytic activity and electrical conductivity. When operated at 800°C with CH₄ as the fuel, the cell achieves a maximum power density of 188.1 mW cm^-2, accompanied by a hydrocarbon selectivity of 54.2%, markedly exceeding the 32.8% obtained in fixed-bed reactor measurements. These results demonstrate that the La_0.7Sr_0.3Al_0.7Ti_0.3O_{3- δ} anode promotes partial fuel oxidation through oxygen-ion conduction while maintaining the electrochemical cycle via electronic conduction.