Novel CO2-tolerant Co-based double perovskite cathode for intermediate temperature solid oxide fuel cells. Issue 3 (March 2023)

• Record Type: Journal Article
• Authors: Liu, Yaowei; Cao, Yuchen; Sun, Shisheng; Lu, Chunling; Wang, Biao; Liu, Gaobin; Gao, Shoushan; Niu, Bingbing
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 3(2023)
• Page Start: 1028
• Page End: 1038
• Publication Date: 2023-03
• Subjects: Solid oxide fuel cells -- Double perovskite cathode -- CO2-tolerance -- Stability -- Electrochemical performance; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.10.068
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: For the commercial application of solid oxide fuel cells (SOFCs), CO2 -tolerant cathode materials with high electrochemical activity are required. Here, we discuss the performance of double perovskite Pr0.2 Sr1.8 CoTiO6−δ (P02STC) as a potential cathode material for SOFCs. P02STC has a cubic structure and keeps lattice structure stable in the CO2 atmosphere. The average thermal expansion coefficient is 17.8 × 10 –6 K –1 at 30–900 °C in air. The P02STC cathode exhibits good electrochemical performance with a low polarization resistance of 0.080 Ωcm 2 at 700 °C. The P02STC cathode shows good structure stability, electrochemical performance stability, and excellent tolerance to CO2 poisoning for the symmetrical cells based on the 350 h stability test in air and the 150 h stability test in O2 containing 5%CO2 at 700 °C. The electrolyte-supported single cell with a P02STC cathode shows a maximum power density of 677 mW cm − 2 at 800 °C. The single cell operates stably for 250 h at a constant current of 0.3 A/cm 2 without obvious degrading performance. According to all of the experimental results, the P02STC sample might be a promising candidate cathode for SOFCs. Highlights: Pr0.2 Sr1.8 TiCoO6-δ (P02STC) has good structural stability in air and pure CO2 . Electrochemical stability test demonstrates the satisfied structure stability and CO2 -resistance ability of P02STC. P02STC as cathode for SOFC exhibits good electrochemical performance and stability.