Infiltration is an effective way to improve the performance of the oxygen electrode for solid oxide cells (SOCs). Most studies on infiltrated SOCs are carried out on button cells with a small active area. Here, we report on the preparation of large-area fuel-electrode-supported SOCs with a La0.6Sr0.4CoO3-δ (LSC) infiltrated gadolinia-doped ceria (CGO) oxygen electrode. The electrochemical performance of the resulting SOCs is examined at 4 × 4 cm2 level (active area). The cell delivers a power density of 1.08 W cm−2 at 0.6 V and 750 °C in fuel cell mode with high fuel and oxygen utilization of 52 and 57%, respectively; in electrolysis mode, the current density reaches 1.07 A cm−2 at 1.3 V and 750 °C with a steam utilization of 60%. Additionally, the influence of feed gas composition on cell performance and the short-term durability of the cell in electrolysis mode are studied. Electrochemical impedance spectroscopy (EIS) results and the post-test microstructural characterization demonstrate that there is no visible degradation of the LSC infiltrated CGO oxygen electrode after the durability test. These results highlight the potential of large-scale production of high-performance SOCs by designing nanostructured electrode via infiltration.
- Reversible solid oxide cell
- Oxygen electrode