Performance optimization of SrFe0.95Ti0.05O3-delta cathode for intermediate temperature SOFC

作者：Yu, Xiuling^*; Fan, Juanjuan; Li, Xue

来源：Ceramics International, 2014, 40(8): 13627-13634.

DOI：10.1016/j.ceramint.2014.05.089

• Thermal expansion
• Composite cathodes
• Electrochemical performance
• Solid oxide fuel cell

Fe-based perovslcite oxide SrFe0.95Ti0.05O3-delta (SFT5) is developed as cathode Materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Single-phase SFT5 solid solution is obtained by sintering the sample at 1250 degrees C for 10 h. The SFT5 material is chemically compatible with the Ce0.8Sm0.2O1.9 (SDC) electrolyte at 1050 degrees C for 2 h. The highest electrical conductivity of 80 S cm(-1) at 650 degrees C in air is obtained from the SFT5 sample. The thermal expansion coefficient (TEC) decreases with an increase in the SDC contents in SFT5 cathode, from 25.9 x 10(-6) K-1 at SFT5 to 17.2 x 10(-6) K-1 at SFT5-SDC30 between 30 and 1000 degrees C in air. Single cells that use SFT5 with 0, 10, 20, and 30 wt% SDC composite as cathodes on a 300 mu m-thick SDC electrolyte reach the peak power density of 360, 466, 513, and 425 mW cm(-2) at 800 degrees C, respectively. The addition of SDC in SFT5 cathode significantly enhances the cell performance and reduces the TEC of the SFT5-SDC composite cathodes. The Ti-substituted SFT5 perovskites and SFT5-SDC composites can be considered cheaper alternative cathode materials for use in IT-SOFCs.

• 出版日期2014-9
• 单位吉林农业大学