Enhanced performance and stability of interlayer-free La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Zr0.2O2−δ cathode for solid oxide fuel cells

• Interlayer-free LSCF-CZ electrode is developed on YSZ.
• CZ impedes the reaction between cathode and YSZ electrolyte.
• Incorporation of oxygen ions from LSCF-CZ cathode into electrolyte is accelerated.
• LSCF-CZ cathode shows high electrochemical stability.

Interlayer-free La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Zr0.2O2−δ (LSCF-CZ) composite cathode on YSZ electrolyte has been studied by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectra (EIS). The addition of CZ suppresses the formation of non-conductive SrZrO3 at the cathode and YSZ electrolyte interface. As a result, the LSCF-CZ cell performance is greatly elevated. The LSCF-CZ cell exhibits 8.7 times higher current density than the LSCF cell at 0.8 V and 600 °C. The incorporation of oxygen anion from LSCF-CZ cathode into YSZ electrolyte is significantly accelerated. The stability of the LSCF-CZ cathode is remarkably improved as compared with the LSCF cathode at 600 °C.

Ce0.8Zr0.2O2−δ-La0.6Sr0.4Co0.2Fe0.8O3−δ (CZ-LSCF) composite cathode on YSZ electrolyte displays excellent electrochemical performance and high stability.Figure optionsDownload as PowerPoint slide