Advanced electrochemical activity and CO2 tolerance of iron-based cathode electrocatalyst for solid oxide fuel cells

Here, we report the Sr0.5Bi0.4Ca0.1FeO3-delta (SBCF) and Sr0.5Bi0.5FeO3-delta (SBF) oxides, which are regarded as the oxygen electrodes for solid oxide fuel cells (SOFCs). The Ca2+ cations that doped into SBF substitutes the Bi3+ site, which can increase the oxygen vacancy concentration, promote the oxygen transport kinetics, enhance the electrical conductivity, and improve the electrochemical activity. Impedance result shows that SBCF possesses a lower polarization resistance of 0.13 Omega cm(2) at 700 degrees C. Additionally, SBCF performs well in single cells, achieving a peak power density of 0.83 W cm(-2) at 650 degrees C and a superior durability for similar to 100 h. When SBCF electrode is exposed to a CO2-containing atmosphere, no carbonate species are formed on SBCF cathode, indicating that SBCF has a good CO2 tolerance. The high activity and good chemical stability make SBCF a potential electrode for SOFCs.

Automated summary

In this study, Sr0.5Bi0.4Ca0.1FeO3-delta (SBCF) and Sr0.5Bi0.5FeO3-delta (SBF) oxides were investigated as oxygen electrodes for solid oxide fuel cells (SOFCs). SBCF showed lower polarization resistance and better chemical stability, suggesting its potential as an electrode for SOFCs.