Citation: ZHAO Chen, ZHANG Ting, HE Yong, QU Liang-Wu, ZHOU Qing-Jun. Preparation and Performance of Sr₃Fe_2-xNi_xO_7-δ (x=0, 0.1, 0.2, 0.3) Cathode for Intermediate-Temperature Solid Oxide Fuel Cells[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(6): 1027-1033. doi: 10.11862/CJIC.2019.113 shu

Preparation and Performance of Sr₃Fe_2-xNi_xO_7-δ (x=0, 0.1, 0.2, 0.3) Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

College of Science, Civil Aviation University of China, Tianjin 300300, China

Corresponding author: ZHOU Qing-Jun, qjzhou@cauc.edu.cn
Received Date: 10 January 2019
Revised Date: 28 March 2019

Figures(6)

Sr₃Fe_2-xNi_xO_7-δ (x=0, 0.1, 0.2, 0.3) were synthesized by a modified complexing sol-gel process as cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The phase structure, thermodynamic properties and electrochemical properties of the materials were characterized by X-ray diffraction, thermal expansion coefficient test, conductivity test, polarization impedance (R_p) test and single cell performance test. The results showed that all samples were successfully synthesized with perovskite-like structure. The Sr₃Fe_2-xNi_xO_7-δ cathode exhibited good chemical compatibility with the Ce_0.8Sm_0.2O_1.9 (SDC) electrolyte at 1 000℃ for 5 h. The coefficient of thermal expansion (TEC) decreased with the increase of x, and the minimum value was 1.839×10^-5 K^-1. Its high temperature conductivity increased with the increase of Ni doping content, and SFN30 had the highest conductivity of 101 S·cm^-1. The R_p of this series of samples showed a trend of decrease first and then increase with the increase of the doping content of Ni. SFN10 had the lowest polarization impedance of 0.078 8 Ω·cm² at 800℃. The trend of the output power of the electrolyte-supported cell was consistent with the trend of polarization impedance. The SFN10 achieved an output power density of 421.6 mW·cm^-2 at 800℃.
- Sr₃Fe_2-xNi_xO_7-δ,
- perovskite-like structure,
- intermediate temperature solid oxide fuel cells,
- cathode material
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通讯作者: 陈斌, bchen63@163.com

Preparation and Performance of Sr₃Fe_2-xNi_xO_7-δ (x=0, 0.1, 0.2, 0.3) Cathode for Intermediate-Temperature Solid Oxide Fuel Cells