Substitution of anions such as F− and Cl− can effectively improve the stability of proton-conducting electrolytes at no expense to proton conduction. However, during operation, F− and Cl− in electrolytes can transfer to the cathodes, which reduces the stability of the electrolytes. In this work, F−-doped Ba0.5Sr0.5Co0.8Fe0.2O3−δ [Ba0.5Sr0.5Co0.8Fe0.2O2.9−δF0.1 (F-BSCF)] was prepared as a potential cathode for proton-conducting solid oxide fuel cells with BaCe0.8Sm0.2F0.1O2.85 electrolyte. The incorporation of F− in the cathode depressed F− diffusion from the electrolyte and improved the stability of button cells. Temperature-changing X-ray photoelectron spectroscopy and electronic conductivity relaxation results demonstrated that the incorporation of F− enhanced the oxygen incorporation kinetics at intermediate temperatures and improved the cathode catalytic performance. Moreover, a button cell prepared with this novel cathode was stable for 270 h at a current density of 300 mA cm−2 and 700 °C, which was much superior than those containing a BSCF cathode.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)