Modification of the Microstructure and Transport Properties of La2CuO4−δ Electrodes via Halogenation Routes

Ruddlesden–Popper type electrodes with composition La2CuO4−δ are alternative cathode materials for solid oxide fuel cells (SOFCs); however, the undoped compound exhibits low electrical conductivity potential applications, which is usually increased by alkaline-earth doping. A promising to doping modification of anionic framework halogen In this study, La2CuO4−0.5xAx (A = F, Cl, Br; x 0–0.3) compounds prepared a freeze-drying precursor method, using an anion strategy. The composition, structure, morphology and properties studied evaluate their use in (SOFCs). halogen-doped show higher improved electrocatalytic activity oxygen reduction reactions when compared pristine material, polarization resistance values 2.5 times lower, i.e., 0.20, 0.11 0.08 Ω cm2 undoped, F- Cl-doped samples, respectively, at 800 °C. Moreover, prevents superficial copper segregation La2CuO4−δ, making it attractive strategy development highly efficient SOFCs.