Performance of composite cathode Sr0.95Ti0.05Co0.95O3-δ-Sm0.2Ce0.8O1.9 used in intermediate temperature SOFCs

Lianghao Yu, Xiaoqing Wang, Lin Bin, Dong Tian, Xiaoyong Lu, Qingwen Gu, Yonghong Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A cathode powder of Sr0.95Ti0.05Co0.95O3-δ (STC) and an electrolyte powder of Sm0.2Ce0.8O1.9 (SDC) were synthesized by a citric acid-nitrates self-propagating combustion method. The composite-cathode was obtained by mixing the STC and SDC powders in a mass ratio of 7:3. The chemical compatibility, electrical conductivity and thermal expansion coefficient of the composite cathode were characterized by X-ray diffraction (XRD), direct current four-terminal method and thermal dilatometer, respectively. The XRD results show that a pure cubic STC perovskite phase can be obtained at 900 ℃ and no second phase is formed in the composite cathode at the operating temperature. The polarization resistance of the electrode is only 0.05 Ω∙cm2 at 650 ℃. The anode-supported solid oxide fuel cells of NiO-SDC│SDC│STC-SDC were fabricated. The electrochemical performances were examined at 450-650 ℃ with humidified hydrogen (about 3% H2O) as a fuel and air as an oxidant. It is demonstrated that the anode-supported half cells can be sintered at 1 350 ℃ with a dense electrolyte layer and porous electrodes, and the single cell with an open circuit voltage of 0.82 V and the maximum power density of 721 mW/cm2 at 650 ℃ can be obtained. These results indicate that STC-SDC is a promising composite cathode candidate for IT-SOFC with SDC electrolyte.

Original languageEnglish (US)
Pages (from-to)852-857
Number of pages6
JournalKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
Volume43
Issue number7
DOIs
StatePublished - Jul 1 2015

Keywords

  • Composite-cathode
  • Intermediate temperature-solid oxide fuel cell
  • Peak power
  • Polarization resistance

ASJC Scopus subject areas

  • Ceramics and Composites
  • Inorganic Chemistry
  • Materials Chemistry

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