J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (9): 828-832.

• Reviews • 上一篇    下一篇

Cobalt-free composite Ba0.5Sr0.5Fe0.9Ni0.1O3-δ-Ce0.8Sm0.2O2?δ as cathode for intermediate-temperature solid oxide fuel cell

储向峰,刘峰,朱伟长,董永平,叶明富,孙文起   

  1. 安徽工业大学
  • 收稿日期:2011-09-20 修回日期:2012-01-04 出版日期:2012-09-28 发布日期:2012-09-28
  • 通讯作者: 储向峰

Cobalt-free Composite Ba0.5Sr0.5Fe0.9Ni0.1O3-δ-Ce0.8Sm0.2O2-δ as Cathode for Intermediate-Temperature Solid Oxide Fuel Cell

Xiangfeng Chu1), Feng Liu1),Weichang Zhu2), Yongping Dong1), Mingfu Ye1), Wenqi Sun1)   

  1. 1) School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China
    2) School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
  • Received:2011-09-20 Revised:2012-01-04 Online:2012-09-28 Published:2012-09-28
  • Contact: Xiangfeng Chu

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摘要：

New cobalt-free composites consisting of Ba0.5Sr0.5Fe0.9Ni0.1O3-δ (BSFN) and Ce0.8Sm0.2O2?δ(SDC) are investigated as possible cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC). BSFN, which is synthesized by auto ignition process, is chemically compatible with SDC up to 1100℃ as indicated with X-ray diffraction analysis. Its electrical conductivity reaches the maximum value of 57 S?cm?1 at 450℃. Its thermal expansion coefficient (TEC) value is 30.9×10-6 K-1, much higher than that of typical electrolytes. The electrochemical behavior of the composites is analyzed via electrochemical impedance spectroscopy with symmetrical cells BSFN-SDC/SDC/BSFN-SDC. The area specific interfacial polarization resistance (ASR) decreases with SDC content of the composite. The resistance at 700℃ is only 0.49 Ωcm2, 0.34 Ωcm2 and 0.31 Ωcm2 when 30 wt.%, 40 wt.%, and 50 wt.% SDC is cooperated to BSFN, respectively. These results suggest that BSFN-SDC is a possible candidate for IT-SOFC cathode.

Abstract:

New cobalt-free composites consisting of Ba0.5Sr0.5Fe0.9Ni0.1O3-δ(BSFN) and Ce0.8Sm0.2O2-δ (SDC) were investigated as possible cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC). BSFN, which was synthesized by auto ignition process, was chemically compatible with SDC up to 1100 °C as indicated by X-ray diffraction analysis. The electrical conductivity of BSFN reached the maximum value of 57 S·cm-1 at 450 °C. The thermal expansion coefficient (TEC) value of BSFN was 30.9×10-6 K-1, much higher than that of typical electrolytes. The electrochemical behavior of the composites was analyzed via electrochemical impedance spectroscopy with symmetrical cells BSFN-SDC/SDC/BSFN-SDC. The area specific interfacial polarization resistance (ASR) decreased with increasing SDC content of the composite. The area specific interfacial polarization resistance (ASR) at 700 °C is only 0.49, 0.34 and 0.31 ­Ω·cm2 when 30, 40, and 50 wt% SDC was cooperated to BSFN, respectively. These results suggest that BSFN-SDC is a possible
candidate for IT-SOFC cathode.

Key words: Ba0.5Sr0.5Fe0.9Ni0.1O3-δ, Cathode, Intermediate-temperature solid oxide fuel cell (IT-SOFC), Solid oxide fuel cell