Design and Study of Ta/P co-doped SrFeO3-δ as Cathode for Solid Oxide Fuel Cells

As a new type of energy conversion device with high efficiency and environmental protection, SOFC (Solid Oxide Fuel Cell) is a very attractive energy conversion device. However, the most important factor limiting the development of SOFC is its high operating temperature, which affects its commercial development. Therefore, optimizing the internal structure of the electrode and developing low temperature cathode materials are also important directions for the future development of solid oxide fuel cells. Due to the different metal and nonmetal doping will have different effects on the performance of SOFC. In this experiment, we have synthesized the Ta/P co-doped SrFeO(3-delta )based cathode material Sr(Fe0.9Ta0.1)(0.95)P0.05O3-delta(STFP) by solid phase method. The feasibility of the cathode material was verified by XRD imaging analysis, oxygen non-stoichiometric ratio analysis, conductivity test, symmetrical cell impedance test, single cell output power test and SEM electron microscope analysis. According to the conductivity test, the maximum of STFP at 690 degrees C is 43.3 S cm(-1). Symmetrical cells were sintered at 1000 degrees C, 900 degrees C and 800 degrees C respectively, the area specific resistance (ASR) results showed that the best sintered performance is at 800 degrees C and the minimum ASR at 750 degrees C is 0.092 Omega cm(2) for STFP cathode based on Sm0.2Ce0.8O1.9 (SDC) electrolyte. Meanwhile, at 700 degrees C the maximum power density of single cell sintered at 800 degrees C is 694 mW cm(-2) .The results show that STFP can be used as a candidate cathode material.

Automated summary

Solid Oxide Fuel Cell (SOFC) is an efficient and environmentally friendly energy conversion device, but its high operating temperature limits its commercial development. Optimizing the electrode's internal structure and developing low temperature cathode materials are important directions for future development. The experiment synthesized Ta/P co-doped SrFeO(3-delta) based cathode material STFP and confirmed its feasibility through various tests. The results show that STFP can be used as a candidate cathode material.