Improved electrochemical performance of Sr2Fe1.5Mo0.4Nb0.1O6-δ -Sm0.2Ce0.8O2-δ composite cathodes by a one-pot method for intermediate temperature solid oxide fuel cells

Mengjie Guan, Wang Sun*, Rongzheng Ren, Qinghua Fan, Jinshuo Qiao, Zhenhua Wang, David Rooney, Jinsheng Feng, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this paper, Sr2Fe1.5Mo0.4Nb0.1O6-δ (SFMNb)-xSm0.2Ce0.8O2-δ (SDC) (x = 0, 20, 30, 40, 50 wt%) composite cathode materials were synthesized by a one-pot combustion method to improve the electrochemical performance of SFMNb cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The fabrication of composite cathodes by adding SDC to SFMNb is conducive to providing extended electrochemical reaction zones for oxygen reduction reactions (ORR). X-ray diffraction (XRD) demonstrates that SFMNb is chemically compatible with SDC electrolytes at temperature up to 1100 °C. Scanning electron microscope (SEM) indicates that the SFMNb-SDC composite cathodes have a porous network nanostructure as well as the single phase SFMNb. The conductivity and thermal expansion coefficient of the composite cathodes decrease with the increased content of SDC, while the electrochemical impedance spectra (EIS) exhibits that SFMNb-40SDC composite cathode has optimal electrochemical performance with low polarization resistance (Rp) on the La0.9Sr0.1Ga0.8Mg0.2O3 electrolyte. The Rp of the SFMNb-40SDC composite cathode is about 0.047 Ω cm2 at 800 °C in air. A single cell with SFMNb-40SDC cathode also displays favorable discharge performance, whose maximum power density is 1.22 W cm-2 at 800 °C. All results indicate that SFMNb-40SDC composite material is a promising cathode candidate for IT-SOFCs.

Original languageEnglish
Pages (from-to)3052-3061
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number4
Early online date11 Jan 2016
DOIs
Publication statusPublished - 30 Jan 2016

Keywords

  • Composite cathode
  • Intermediate-temperature solid oxide fuel cells
  • One-pot combustion method
  • Perovskite

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Fingerprint Dive into the research topics of 'Improved electrochemical performance of Sr<sub>2</sub>Fe<sub>1.5</sub>Mo<sub>0.4</sub>Nb<sub>0.1</sub>O<sub>6-δ</sub> -Sm<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>2-δ</sub> composite cathodes by a one-pot method for intermediate temperature solid oxide fuel cells'. Together they form a unique fingerprint.

  • Cite this