A heuristic approach to boost the performance and Cr poisoning tolerance of solid oxide fuel cell cathode by robust multi-doped ceria coating

Herein, highly conductive, robust, and innovative Gd and Pr multi-doped ceria (GPDC) coating, to boost the ORR kinetics and stability against Cr poisoning of the state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode, is re-ported. The GPDC coating significantly enhanced the ORR kinetics by ameliorating the surface of the LSCF cathode and showed a two-fold increment in the electrochemical performance compared to the cell with a bare LSCF cathode. The SOFC with GPDC-coated LSCF cathode showed outstanding stability at 700 degrees C for 500 h with a degradation rate of 0.001% h-1 in an accelerated Cr poisoning test which is attributed to the alleviation of the formation in SrCrO4. Both distributions of relaxation time-based analysis and experimental results indicate that the GPDC coating improves the ORR activity and Cr tolerance of the LSCF cathode. This study provides a comprehensive and smart strategy to tailor the surface of SOFC cathode materials to enhance performance and durability.

Automated summary

Here, we report a highly conductive, robust, and innovative Gd and Pr multi-doped ceria (GPDC) coating to enhance the ORR kinetics and stability against Cr poisoning of the state-of-the-art LSCF cathode. The GPDC coating significantly improves the ORR kinetics by improving the surface of the LSCF cathode and shows a two-fold increase in electrochemical performance compared to the bare LSCF cathode. It also exhibits outstanding stability in an accelerated Cr poisoning test, attributed to the alleviation of SrCrO4 formation. Both relaxation time-based analysis and experimental results confirm that the GPDC coating enhances the ORR activity and Cr tolerance of the LSCF cathode.