Oxygen Reduction Response of La and Ce Co-Doped SrCoO3-δ Perovskite Oxide Grown on Porous Ni-Foam Substrate

Lately, ceramic fuel cells (CFCs) have held exceptional promise for joint small- and large-scale applications. However, the low-oxygen reduction response of cathode materials has hindered the low operating temperature of CFCs. Herein, we have developed a semiconductor based on La and Ce co-doped SrCoO3 and embedded them in porous Ni-foam to study their electrochemical properties. The porous Ni-foam-pasted La0.2Sr0.8Co0.8Ce0.2O3-delta cathode displays small-area-specific resistance and excellent ORR (oxygen reduction reaction) activity at low operating temperatures (LT) of 450-500 degrees C. The proposed device has delivered an impressive fuel cell performance of 440 mW-cm(-2), using La0.2Sr0.8Co0.8Ce0.2O3-delta embedded on porous Ni-foam substrate cathode operation at 550 & DEG;C with H-2 fuel and atmospheric air. It even can function well at a lower temperature of 450 degrees C. Moreover, La0.2Sr0.8Co0.8Ce0.2O3-delta embedded on porous Ni-foam shows very good activation energy compared to individual SrCoO3 and La0.1Sr0.9Co0.9Ce0.1O3-delta embedded on porous Ni-foam, which help to promote ORR activity. Different characterization has been deployed, likewise: X-ray diffraction, photoelectron-spectroscopy, and electrochemical impedance spectroscopy for a better understanding of improved ORR electrocatalytic activity of prepared La0.2Sr0.8Co0.8Ce0.2O3-delta embedded on porous Ni-foam substrate. These results can further help to develop functional cobalt-free electrocatalysts for LT-SOFCs.

Automated summary

Recently, ceramic fuel cells (CFCs) have shown great potential for both small- and large-scale applications. However, the low-oxygen reduction response of cathode materials hampers the low operating temperature of CFCs. In this study, a semiconductor based on La and Ce co-doped SrCoO3 was developed and embedded in porous Ni-foam to investigate its electrochemical properties. The cathode of La0.2Sr0.8Co0.8Ce0.2O3-delta pasted on porous Ni-foam exhibited low-area-specific resistance and excellent ORR activity at temperatures as low as 450-500 degrees C. The device achieved an impressive fuel cell performance of 440 mW-cm(-2) at 550 degrees C using H-2 fuel and atmospheric air. It also showed good activation energy and improved ORR activity compared to other similar materials. These findings contribute to the development of cobalt-free electrocatalysts for low-temperature solid oxide fuel cells (LT-SOFCs).