Controlling surface co-exsolution nanoparticle in double perovskite for boosted CO2 electrocatalytic kinetics based symmetric solid oxide electrolysis cells

Symmetric solid oxide cells (SSOCs) have attracted much attention due to their high energy conversion efficiency and simple manufacturing. The present study involves the synthesis of a class of double perovskite oxides, which serve as electrodes for SSOCs. These oxides exhibit exceptional stability in an oxidizing atmosphere, maintaining their single-phase double perovskite structure. Moreover, they facilitate the co-exsolution of metal nanoparticles from both A and B-sites under reducing conditions. By optimizing the doping amount of Bi in Sr2-xBixFeTiO6-delta (SBxFT), co-exsolved Bi and Fe nanoparticles decorated double perovskite oxides were obtained in reducing atmosphere and employed as high-performance electrodes for SSOCs. With Sr1.2Bi0.8FeTiO6-delta as the electrode, the maximum power density achieves 537 mW cm(-2) at 850 degrees C. In electrolysis mode, the current density for pure CO2 electrolysis reaches 1.43 A cm(-2) at an applied voltage of 1.5 V and 850 degrees C. All of these results indicate that co-exsolution of components on perovskite is an effective design technique for creating materials with desirable features.