Electrochemical performance of SmBaCo 2O 5+δ- Sm 0.2Ce 0.8O 1.9 as composite-cathode for intermediate temperature solid oxide fuel cells

Xiaolian Wang, Yanzhi Ding, Lin Bin, Xiaoyong Lu, Yonghong Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The cathode powder of double perovskites-type SmBaCo 2O 5+δ(SBCO) and electrolyte powder of fluorite-structure Sm 0.2Ce 0.8O 1.9(SDC) were synthesized by a citric acid-nitrates self-propagating combustion method. The composite-cathode was obtained by mixing and grinding the SBCO and SDC powders at a mass ratio of 3:2. The chemical compatibility, electrical conductivity and thermal expansion coefficient (TEC) of the composite-cathode (SBCO-SDC) were characterized by X-ray diffraction, direct current four-terminal method and thermal dilatometry, respectively. An anode-supporting fuel cell of Ni-SDC|SDC|SBCO-SDC was fabricated and the performance of the cell was analyzed. The cross-section microstructure and polarization of the cell were investigated using a scanning electron microscope (SEM) and AC impedance spectroscopy. The results indicate that there are no interactions between SBCO and SDC at 1000°C. The electrical conductivity of the SBCO-SDC composite-cathode reached to 369-234 S/cm at 450-800°C. The addition of SDC decreased the TEC of the composite-cathode. The single cell has an ideal microstructure and a good interface among anode, electrolyte and cathode. The polarization resistance of the electrodes was 0.031 Ω·cm 2 at 650°C. The cell with an open-circuit potential of 0.77 V and a maximum output power density of 640 mW/cm 2 was obtained when the humidified (about 3% H 2O) hydrogen as a fuel and air as oxidant were used at 650°C. It was demonstrated that the SBCO-SDC composite-cathode could be used as a potential candidate cathode for intermediate temperature solid oxide fuel cell.

Original languageEnglish (US)
Pages (from-to)1524-1529
Number of pages6
JournalKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
Volume40
Issue number10
StatePublished - Oct 1 2012

Keywords

  • Composite-cathode
  • Electrochemical performance
  • Intermediate temperature solid oxide fuel cell
  • Polarization

ASJC Scopus subject areas

  • Ceramics and Composites
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Electrochemical performance of SmBaCo <sub>2</sub>O <sub>5+δ</sub>- Sm <sub>0.2</sub>Ce <sub>0.8</sub>O <sub>1.9</sub> as composite-cathode for intermediate temperature solid oxide fuel cells'. Together they form a unique fingerprint.

Cite this